TRT and DHT: Gel vs Injection DHT Data (2026)

Yes, TRT can raise DHT. Some testosterone converts to DHT through 5-alpha reductase. Treatment format matters: across 32 studies, transdermal testosterone delivered by gel or patch raised blood DHT about 5.5-fold, while intramuscular injections raised it about 2.2-fold. Those are pooled group averages, not a prediction for you.

Here's the part most pages skip: the DHT number on your lab report is not a direct reading of the DHT in your scalp or your prostate. That one fact changes how you should read a "high DHT" flag, and what (if anything) you should do about it.

TRT and DHT: conversion, format evidence, laboratory units, tissue context and DHT blockers table 1: Comparison
Treatment format	Average rise in blood DHT
Testosterone injection into muscle	About 2.2×
Transdermal testosterone gel or patch	About 5.5×
Testosterone applied to scrotal skin	Can produce high serum DHT; separate studies are not directly comparable with the pooled groups above

TRT and DHT: conversion, format evidence, laboratory units, tissue context and DHT blockers table 1: Comparison: read as text

Testosterone injection into muscle

Average rise in blood DHT: About 2.2×

Transdermal testosterone gel or patch

Average rise in blood DHT: About 5.5×

Testosterone applied to scrotal skin

Average rise in blood DHT: Can produce high serum DHT; separate studies are not directly comparable with the pooled groups above

Pooled averages from a 32-study review (Borst et al., BMC Medicine, 2014) for intramuscular versus transdermal gel/patch therapy, plus separate scrotal-application studies cited below. Group averages, not a prediction for you.

By TRT Provider Guide · Editorial research using public sources; not clinically reviewed · Last verified: October 2026 · Educational information, not medical advice. If you have chest pain, trouble breathing, or another emergency, call 911.

Last updated: October 26, 2026.

Affiliate disclosure: TRT Provider Guide may earn compensation through certain provider links. Commercial relationships do not change our editorial conclusions. Full disclosure.

TRT Provider Guide is the independent decision resource for testosterone replacement therapy — helping U.S. adults understand how low testosterone is evaluated, compare online and local care models and providers, and choose the next step that fits their health needs, fertility plans, budget, state, and care preferences, with every material claim verified and dated.

This page is for you if: you're on TRT or thinking about it, and you want to understand DHT before you pick a format, read a lab result, or add a DHT blocker.

Start with specialist evaluation instead if: you have prostate or breast cancer, a concerning prostate finding, a PSA above 4 ng/mL (or above 3 ng/mL with high prostate-cancer risk without further urologic evaluation), or you're trying to conceive soon. Those situations need the appropriate urology, reproductive-urology, endocrinology, oncology, or other clinician-led evaluation before a testosterone decision.

This page covers adult men treated for low testosterone. Women and transgender or gender-diverse people who use testosterone have different goals and evidence. Talk with a clinician who treats your situation.

Does TRT increase DHT?

Yes. When TRT raises your testosterone, some of that extra testosterone becomes DHT, so blood DHT usually rises too. How much depends on the format, the dose, and your body. It does not mean "all your testosterone is turning into DHT."

A lot of guys worry about exactly that. One look at a flagged lab and the mind goes to "it's all converting."

It isn't. Here's what the research actually shows:

Only a small slice converts. Classic tracer studies in healthy men found that roughly 4% to 6% of testosterone in the blood is converted to DHT. Testosterone conversion accounts for at least 70% of the DHT circulating in men. (Ito and Horton, Journal of Clinical Investigation, 1971; PubMed 755039.)
DHT normally runs well below testosterone. In untreated adult men, serum DHT is typically much lower than total testosterone. On TRT, DHT can rise with testosterone, and the size of that rise depends in part on treatment route. (Endocrine Reviews review, 2017; Borst et al., BMC Medicine, 2014.)
More testosterone doesn't mean endlessly more DHT. In a dose study of testosterone injections, DHT rose with dose but started to level off at higher doses. Scientists call that "saturable." (Coviello/Bhasin et al., JCEM, 2010.)

Total testosterone, by the way, is all the testosterone in your blood, both the part stuck to proteins and the part floating free. When we compare testosterone and DHT on this page, that's the testosterone number we mean.

So DHT going up on TRT is normal. The real questions are how much, where, and does it matter for you. That's what the rest of this page answers.

Why the right next step depends on your situation

The right TRT provider is not the same for every person — it depends on whether low testosterone has been properly evaluated, your symptoms and health history, your fertility plans, your state, your insurance or cash-pay preference, your treatment-format preference, your budget, and whether online or in-person care is the better starting point. Some situations belong with primary care, urology, endocrinology, reproductive urology, or urgent or emergency care when the symptoms warrant it. Because a general answer cannot resolve those for you, use TRT Provider Guide's Find My TRT Path tool to map your situation to the right care route and the questions to ask before you pay.

DHT is one input to that decision. It isn't the whole decision. And if low testosterone hasn't been properly confirmed yet, that comes first: see why two low testosterone tests matter.

How does testosterone convert to DHT?

An enzyme called 5-alpha reductase changes testosterone into DHT, mostly inside skin, hair follicles, and the prostate. DHT grabs the body's androgen receptor more tightly than testosterone does. That's why small amounts of DHT have outsized effects in those tissues.

Think of testosterone as a raw material. Your body sends it down two main side roads:

TRT and DHT: conversion, format evidence, laboratory units, tissue context and DHT blockers table 2: How does testosterone convert to DHT?
Pathway	Enzyme	What it makes	Where it matters most
Testosterone → DHT	5-alpha reductase	Dihydrotestosterone (DHT)	Prostate, scalp hair follicles, beard and body hair, oil glands in skin
Testosterone → estradiol	Aromatase	Estradiol (a form of estrogen)	Bone, brain, fat tissue, breast tissue

TRT and DHT: conversion, format evidence, laboratory units, tissue context and DHT blockers table 2: How does testosterone convert to DHT?: read as text

Testosterone → DHT

Enzyme: 5-alpha reductase
What it makes: Dihydrotestosterone (DHT)
Where it matters most: Prostate, scalp hair follicles, beard and body hair, oil glands in skin

Testosterone → estradiol

Enzyme: Aromatase
What it makes: Estradiol (a form of estrogen)
Where it matters most: Bone, brain, fat tissue, breast tissue

That second row clears up a common mix-up. Breast tenderness or swelling on TRT ("gyno") is mainly an estradiol issue, not a DHT issue. A "DHT blocker" won't fix it.

Two types of the enzyme

There are two main types of 5-alpha reductase that matter here:

Type 2 is concentrated in the prostate, genital skin, and hair follicles. Finasteride blocks this type.
Type 1 is found more widely in skin and the liver. Dutasteride blocks both type 1 and type 2.

That's why the two drugs lower DHT by different amounts. More on them later.

What DHT does in an adult man

DHT is not a villain. It's a normal male hormone. In adult men it helps drive:

prostate growth
beard and body hair
oil production in the skin
scalp hair thinning, but only in men whose follicles are genetically sensitive to it

The surprise in the research: blocking conversion to DHT did not erase several measured effects of testosterone in one randomized trial. Men who got testosterone plus dutasteride had similar changes in lean mass, strength, sexual function, and other measured outcomes to men who got testosterone without dutasteride (Bhasin et al., JAMA, 2012). That trial does not prove DHT is unnecessary for every effect in every man. We'll come back to it when we talk about DHT blockers.

Does a high DHT blood test mean you have too much DHT in your tissues?

Not necessarily. Blood DHT and the DHT inside your prostate or scalp are controlled separately, so a high serum (blood) DHT number is not a direct reading of tissue DHT. In studies of men using testosterone gel, blood DHT rose about three- to fivefold without a matching rise in prostate DHT.

This is the most important idea on the page. So let's slow down.

Your tissues make and break down their own DHT. They keep tight control over how much they hold. What spills into your bloodstream is a bit like the exhaust from a building. It tells you something is happening inside. It doesn't tell you exactly what's happening in each room.

TRT and DHT: conversion, format evidence, laboratory units, tissue context and DHT blockers table 3: Does a high DHT blood test mean you have too much DHT in your tissues?
Comparison	Blood (serum) DHT	DHT inside tissues
What it is	DHT circulating in your bloodstream	DHT made and used inside the prostate, scalp, and other tissues
Can you test it?	Yes, with a standard blood draw	Not with a routine test
Does it rise on TRT?	Usually, and more with skin products	Tissues regulate it locally; it doesn't simply track blood levels
What it's good for	A clue about conversion and format	It's what actually acts on the tissue

TRT and DHT: conversion, format evidence, laboratory units, tissue context and DHT blockers table 3: Does a high DHT blood test mean you have too much DHT in your tissues?: read as text

What it is

Blood (serum) DHT: DHT circulating in your bloodstream
DHT inside tissues: DHT made and used inside the prostate, scalp, and other tissues

Can you test it?

Blood (serum) DHT: Yes, with a standard blood draw
DHT inside tissues: Not with a routine test

Does it rise on TRT?

Blood (serum) DHT: Usually, and more with skin products
DHT inside tissues: Tissues regulate it locally; it doesn't simply track blood levels

What it's good for

Blood (serum) DHT: A clue about conversion and format
DHT inside tissues: It's what actually acts on the tissue

What the studies show:

Testosterone gel, normal men. Two studies of men given testosterone gel at normal-to-high-normal doses found blood DHT rose about three- to fivefold, but prostate DHT didn't change. (Summarized in Endocrine Reviews, 2017.)
DHT gel, healthy men. In a randomized, placebo-controlled trial, men aged 35 to 55 used DHT gel for four weeks. Their blood DHT shot well above normal. The DHT measured inside their prostate tissue did not differ from placebo, and androgen-controlled genes in the prostate didn't change either (Page et al., JCEM, 2011).
The big-picture review. A 2017 review in Endocrine Reviews concluded that blood DHT on TRT doesn't track DHT in androgen-sensitive tissues, and that the modest DHT rises seen on TRT are unlikely to be a cause for clinical concern.

What this does not prove: that any DHT level is safe forever, or that scalp follicles behave the same way as the prostate. It proves something narrower and more useful. A single blood DHT number can't tell you, by itself, that your prostate or scalp is in trouble. Context does that.

Do gels and creams raise DHT more than injections?

On average in the pooled evidence, transdermal gel or patch raised serum DHT more than intramuscular injection. In a review of 32 studies (1,152 men), transdermal gel/patch therapy raised blood DHT about 5.5-fold versus about 2.2-fold for intramuscular injection, while the rise in testosterone did not differ significantly between those route groups.

That's the core finding from Borst et al. (BMC Medicine, 2014). It is a pooled comparison of older intramuscular and transdermal gel/patch studies, not a head-to-head trial of every modern product or dosing schedule. Your own numbers can land higher or lower.

Format by format: what the evidence shows about DHT

We pulled this table together from drug labels and published studies. You won't find these rows side by side anywhere else.

TRT and DHT: conversion, format evidence, laboratory units, tissue context and DHT blockers table 4: Format by format: what the evidence shows about DHT
Treatment format	FDA status	What the evidence shows about DHT	What it means if you're prone to hair loss
Injection into muscle (testosterone cypionate or enanthate)	FDA-approved products exist. Compounded versions are also sold, so ask which you're getting	About 2.2× average rise in blood DHT in the 32-study review	Lower average serum-DHT rise than transdermal gel/patch in the pooled data; not proof that every injection regimen is lower for every person
Injection under the skin (subcutaneous, including daily clinic protocols)	Depends on the exact product and prescribing use	We found no head-to-head DHT trial showing that daily subcutaneous injections produce lower DHT than weekly intramuscular injections	Do not assume a daily or subcutaneous schedule lowers DHT without product- and regimen-specific data
Gel on approved body sites (for example, AndroGel)	FDA-approved products exist	The 32-study pooled transdermal group (gel + patch) rose about 5.5×. The AndroGel 1% label says DHT rose in parallel with testosterone; mean steady-state DHT/T ratios were 0.23–0.29 at 5 g/day and 0.27–0.33 at 10 g/day	Transdermal gel/patch produced a larger average serum-DHT rise than intramuscular therapy in the pooled review; that does not rank every FDA-approved product
Compounded testosterone cream on body skin	Not FDA-approved	DHT exposure depends on formulation, dose, and application site. The 32-study 5.5× estimate should not be applied to compounded creams as if they were all the same as FDA-approved gels or patches	Ask exactly where the cream is intended to be applied and do not assume its hair effect from serum-DHT data alone
Testosterone applied to scrotal skin	U.S. compounded creams are not FDA-approved finished products	Older scrotal-patch work found high serum DHT, and a 2017 pharmacokinetic study found scrotal cream had about 8-times greater bioavailability than a non-scrotal comparison; serum DHT also rose after application	Scrotal application can produce high serum DHT. If hair loss is a concern, ask about the intended application site before treatment
Oral testosterone undecanoate (Jatenzo, Kyzatrex, Tlando)	FDA-approved	Raises DHT along with testosterone. Check each product's label for its specific DHT data	Ask your prescriber how the product you're offered compares. See our oral testosterone guide
Clomiphene or enclomiphene	Not testosterone therapy. Clomiphene's FDA approval is for ovulation problems in women, so use in men is off-label. There's no FDA-approved finished enclomiphene product	These raise your body's own testosterone. They aren't a "low-DHT TRT" and they aren't TRT at all	A different decision entirely. See enclomiphene with TRT

TRT and DHT: conversion, format evidence, laboratory units, tissue context and DHT blockers table 4: Format by format: what the evidence shows about DHT: read as text

Injection into muscle (testosterone cypionate or enanthate)

FDA status: FDA-approved products exist. Compounded versions are also sold, so ask which you're getting
What the evidence shows about DHT: About 2.2× average rise in blood DHT in the 32-study review
What it means if you're prone to hair loss: Lower average serum-DHT rise than transdermal gel/patch in the pooled data; not proof that every injection regimen is lower for every person

Injection under the skin (subcutaneous, including daily clinic protocols)

FDA status: Depends on the exact product and prescribing use
What the evidence shows about DHT: We found no head-to-head DHT trial showing that daily subcutaneous injections produce lower DHT than weekly intramuscular injections
What it means if you're prone to hair loss: Do not assume a daily or subcutaneous schedule lowers DHT without product- and regimen-specific data

Gel on approved body sites (for example, AndroGel)

FDA status: FDA-approved products exist
What the evidence shows about DHT: The 32-study pooled transdermal group (gel + patch) rose about 5.5×. The AndroGel 1% label says DHT rose in parallel with testosterone; mean steady-state DHT/T ratios were 0.23–0.29 at 5 g/day and 0.27–0.33 at 10 g/day
What it means if you're prone to hair loss: Transdermal gel/patch produced a larger average serum-DHT rise than intramuscular therapy in the pooled review; that does not rank every FDA-approved product

Compounded testosterone cream on body skin

FDA status: Not FDA-approved
What the evidence shows about DHT: DHT exposure depends on formulation, dose, and application site. The 32-study 5.5× estimate should not be applied to compounded creams as if they were all the same as FDA-approved gels or patches
What it means if you're prone to hair loss: Ask exactly where the cream is intended to be applied and do not assume its hair effect from serum-DHT data alone

Testosterone applied to scrotal skin

FDA status: U.S. compounded creams are not FDA-approved finished products
What the evidence shows about DHT: Older scrotal-patch work found high serum DHT, and a 2017 pharmacokinetic study found scrotal cream had about 8-times greater bioavailability than a non-scrotal comparison; serum DHT also rose after application
What it means if you're prone to hair loss: Scrotal application can produce high serum DHT. If hair loss is a concern, ask about the intended application site before treatment

Oral testosterone undecanoate (Jatenzo, Kyzatrex, Tlando)

FDA status: FDA-approved
What the evidence shows about DHT: Raises DHT along with testosterone. Check each product's label for its specific DHT data
What it means if you're prone to hair loss: Ask your prescriber how the product you're offered compares. See our oral testosterone guide

Clomiphene or enclomiphene

FDA status: Not testosterone therapy. Clomiphene's FDA approval is for ovulation problems in women, so use in men is off-label. There's no FDA-approved finished enclomiphene product
What the evidence shows about DHT: These raise your body's own testosterone. They aren't a "low-DHT TRT" and they aren't TRT at all
What it means if you're prone to hair loss: A different decision entirely. See enclomiphene with TRT

FDA-approved means the FDA reviewed that exact finished product for safety, effectiveness, and quality before it could be sold. Compounded means a pharmacy mixed it for individual patients. The FDA does not review compounded drugs for safety, effectiveness, or quality before they're sold.

Does putting testosterone cream on the scrotum raise DHT?

Yes. Scrotal application can produce much greater testosterone absorption than non-scrotal application and can raise serum DHT. In a 2017 pharmacokinetic study, scrotal cream had about eight-times greater bioavailability than the non-scrotal comparison used by the investigators. Older scrotal-patch studies also reported high serum DHT.

Some clinics recommend scrotal application because absorption is high. That's a real trade-off: the same application site that improves absorption can also produce higher serum DHT.

If hair is your worry, application site is one concrete thing to ask about. Serum DHT still cannot tell you by itself whether your scalp follicles will miniaturize.

Do under-the-skin or daily injections change DHT?

We found no direct study showing that daily subcutaneous injections keep DHT lower than weekly intramuscular injections. Injection avoids transdermal absorption through the skin, but frequency and injection site should not be turned into a DHT claim without direct comparative data.

What we can say: testosterone dose affects DHT conversion in controlled studies. Whether a smaller, more frequent injection schedule lowers DHT in a clinically meaningful way is unproven.

Treatment format is one of the clearest DHT-related choices you can discuss with your clinician.

If hair or prostate health matters to you, choosing a format on purpose beats reacting after the fact. Map your situation — format preference, fertility plans, state, budget — and get the questions to bring to any clinician.

Map my TRT care route →

Free and educational. Find My TRT Path doesn't diagnose low testosterone, read your lab results, or guarantee a prescription.

Will higher DHT on TRT make you lose your hair?

DHT matters most for androgenetic (male-pattern) hair loss when scalp follicles are genetically susceptible to androgens. TRT can increase androgen exposure, but a serum DHT result cannot predict by itself whether you will lose hair or how fast. Other causes of shedding can also occur.

Male pattern hair loss has a medical name: androgenetic alopecia. In men who carry the genes for it, DHT slowly shrinks hair follicles at the temples and crown. Each new hair grows back thinner and shorter, until some follicles stop producing visible hair.

Same hormone, different follicles. That's why a man on TRT can grow a thicker beard while his hairline moves back. Beard and body follicles respond to DHT by growing. DHT-sensitive scalp follicles respond by shrinking.

What the evidence does and doesn't show:

DHT is a key androgen driver of male-pattern hair loss in susceptible follicles. Finasteride, which lowers DHT by blocking type II 5-alpha reductase, is FDA-approved for male-pattern hair loss in men.
We found no good trial comparing hair-loss rates between TRT formats. The idea that gels are worse for hair than injections comes from the DHT data above. It's a reasonable inference, but it's an inference.
A blood DHT number can't predict whether you'll lose hair. Follicle sensitivity matters more than the number.

Is it really pattern hair loss?

Not all shedding on TRT is DHT-driven. Pattern loss shows up at the temples and crown. Shedding all over the head can come from thyroid problems, low iron, rapid weight loss, stress, or scalp conditions like seborrheic dermatitis.

If you're losing hair, a dermatologist can tell you which one you're dealing with. That's worth knowing before you change anything about your TRT.

Will hair come back if you switch formats or stop?

There's no guarantee. Lowering DHT exposure may slow further loss. It doesn't promise regrowth. And stopping TRT may allow symptoms to return if treatment was helping, so do not make that change on your own.

Don't stop or switch on your own. Talk with your prescriber. Some men switch formats, some add hair treatment, and some decide the trade-off is fine. All three are reasonable choices to make with a clinician.

Is high DHT on TRT bad for your prostate?

Androgens affect prostate biology, and testosterone treatment can change PSA and prostate-related outcomes, which is why prostate risk is monitored in appropriate patients. In TRAVERSE, a large placebo-controlled trial of carefully screened men, high-grade prostate cancer was rare and not significantly different between testosterone and placebo (0.19% vs 0.12%). Blood DHT alone cannot measure prostate risk.

PSA (prostate-specific antigen) is a protein made by the prostate. It's the blood test used to watch for prostate problems.

Here's what the best evidence says:

TRAVERSE (2023). Among more than 5,000 middle-aged and older men with low testosterone, high-grade prostate cancer occurred in 5 of 2,596 men on testosterone (0.19%) and 3 of 2,602 on placebo (0.12%). That difference wasn't statistically significant. Rates of any prostate cancer, urinary retention, and prostate procedures didn't differ either (JAMA Network Open, 2023).
The fine print matters. TRAVERSE screened out men at high prostate-cancer risk. Average follow-up was under three years. And it measured outcomes, not DHT. So it tells you TRT in screened men didn't raise prostate cancer rates. It doesn't tell you about men with prostate disease or very high doses.
Tissue control again. As covered above, blood DHT rises on TRT without a matching rise in prostate DHT in the studies that measured both.

What guidelines actually monitor

The Endocrine Society's guideline doesn't use DHT to watch the prostate. It uses PSA and a prostate exam, based on age and risk:

Don't start TRT with prostate or breast cancer, a prostate lump, a PSA above 4 ng/mL, or a PSA above 3 ng/mL with high prostate-cancer risk.
For men who choose prostate monitoring (the guideline calls for shared decision-making for men 55 to 69), check prostate-cancer risk before starting and again 3 to 12 months after.
Refer to a urologist if PSA rises more than 1.4 ng/mL within 12 months, or if a PSA above 4 ng/mL is confirmed.

If you already have an enlarged prostate, read TRT with an enlarged prostate. That's also where DHT blockers have their clearest use alongside TRT (more below).

What are normal DHT levels on testosterone?

Mayo Clinic Laboratories lists 112 to 955 pg/mL as the reference range for adult men. That's the same as 11.2 to 95.5 ng/dL. No guideline sets a "target" DHT on TRT. Your own lab's range, units, and testing method matter more than any number you find online.

One reason DHT results confuse people: they often arrive in different units from testosterone. Testosterone is usually reported in ng/dL. DHT is often in pg/mL. A DHT of "450" can look alarming next to a testosterone of "650" until you convert it.

DHT lab translator

TRT and DHT: conversion, format evidence, laboratory units, tissue context and DHT blockers table 5: DHT lab translator
What you're looking at	Value
Adult male (over 19) DHT reference range, Mayo Clinic Laboratories	112–955 pg/mL
Same range in ng/dL (divide pg/mL by 10)	11.2–95.5 ng/dL
Same range in nmol/L (divide pg/mL by 290.4)	About 0.39–3.29 nmol/L
Typical DHT compared with testosterone in men not on TRT	About one-tenth
If you take finasteride or dutasteride	A lower DHT result is an expected pharmacologic effect of blocking 5-alpha reductase; interpret it in that medication context

TRT and DHT: conversion, format evidence, laboratory units, tissue context and DHT blockers table 5: DHT lab translator: read as text

Adult male (over 19) DHT reference range, Mayo Clinic Laboratories

Value: 112–955 pg/mL

Same range in ng/dL (divide pg/mL by 10)

Value: 11.2–95.5 ng/dL

Same range in nmol/L (divide pg/mL by 290.4)

Value: About 0.39–3.29 nmol/L

Typical DHT compared with testosterone in men not on TRT

Value: About one-tenth

If you take finasteride or dutasteride

Value: A lower DHT result is an expected pharmacologic effect of blocking 5-alpha reductase; interpret it in that medication context

Mayo's range comes from its LC-MS/MS method. Other labs use other methods and ranges. Always read your result against the range printed on your own report.

LC-MS/MS (liquid chromatography–tandem mass spectrometry) is a precise lab method. DHT sits at low levels in blood, so measurement method matters. Results from different labs or methods aren't always directly comparable.

What a DHT result can and can't tell you

TRT and DHT: conversion, format evidence, laboratory units, tissue context and DHT blockers table 6: What a DHT result can and can't tell you
Your question	What the evidence supports	What the number can't prove	Smart next step
"Did TRT raise my DHT?"	TRT usually raises blood DHT	Exactly how much it will rise for you	Compare before-and-after results from the same lab if you can
"Is my high DHT dangerous?"	DHT commonly rises on TRT, more with skin products	That your tissues hold too much DHT	Read it against your lab's range, your symptoms, and your PSA
"Is all my testosterone becoming DHT?"	Only a small share converts	That most of your testosterone is being diverted	Look at testosterone and DHT together, with your clinician
"Does this mean prostate trouble?"	The prostate controls its own DHT	Anything about prostate DHT or disease	Follow standard PSA and prostate monitoring
"Will I lose my hair?"	DHT drives pattern hair loss in sensitive follicles	Whether your follicles are sensitive	See a dermatologist if you notice progressive thinning
"Should I lower my DHT?"	DHT blockers lower it	That a lab flag alone means you need treatment	Decide based on an actual problem: hair loss, prostate symptoms, or something else

TRT and DHT: conversion, format evidence, laboratory units, tissue context and DHT blockers table 6: What a DHT result can and can't tell you: read as text

"Did TRT raise my DHT?"

What the evidence supports: TRT usually raises blood DHT
What the number can't prove: Exactly how much it will rise for you
Smart next step: Compare before-and-after results from the same lab if you can

"Is my high DHT dangerous?"

What the evidence supports: DHT commonly rises on TRT, more with skin products
What the number can't prove: That your tissues hold too much DHT
Smart next step: Read it against your lab's range, your symptoms, and your PSA

"Is all my testosterone becoming DHT?"

What the evidence supports: Only a small share converts
What the number can't prove: That most of your testosterone is being diverted
Smart next step: Look at testosterone and DHT together, with your clinician

"Does this mean prostate trouble?"

What the evidence supports: The prostate controls its own DHT
What the number can't prove: Anything about prostate DHT or disease
Smart next step: Follow standard PSA and prostate monitoring

"Will I lose my hair?"

What the evidence supports: DHT drives pattern hair loss in sensitive follicles
What the number can't prove: Whether your follicles are sensitive
Smart next step: See a dermatologist if you notice progressive thinning

"Should I lower my DHT?"

What the evidence supports: DHT blockers lower it
What the number can't prove: That a lab flag alone means you need treatment
Smart next step: Decide based on an actual problem: hair loss, prostate symptoms, or something else

What does low DHT on TRT mean?

A low DHT result can reflect reduced conversion from finasteride or dutasteride, testing differences, or less common endocrine causes. One low number does not prove that DHT is causing symptoms such as low libido or erectile problems.

Some men see the opposite of what they expected: healthy testosterone, low DHT. Common reasons:

You take finasteride or dutasteride. These drugs are designed to lower DHT. Mayo notes that men on these drugs have reduced DHT levels.
Lab or timing differences. Different methods and labs give different numbers.
Rare enzyme deficiency. Genetic 5-alpha reductase deficiency exists but is rare, and it's usually found much earlier in life.

Can low DHT cause low libido or erection problems? We can't tell you that from a lab value, and nobody else can either. In the Bhasin trial, sexual function on testosterone didn't differ when DHT was blocked with dutasteride. Separately, DHT-blocker labels list sexual side effects in a small share of men. Both are true. If you have new symptoms, bring them to your prescriber rather than chasing a DHT number.

Should DHT be tested routinely on TRT?

No major TRT guideline we reviewed makes routine DHT testing a requirement for every patient. Standard monitoring focuses on testosterone levels, hematocrit, PSA, symptoms, and side effects. A DHT test can still be useful in specific situations.

Hematocrit is the share of your blood made up of red blood cells. TRT can raise it, which is why it's monitored.

When a DHT test can make sense: a clinician may order it when the result would answer a specific endocrine, medication, or specialist question. Major TRT guidelines do not make serum DHT a universal baseline or follow-up test, so do not assume more DHT testing is automatically better.

See what blood tests are required before TRT for the full monitoring picture.

What should you do if your DHT comes back high on TRT?

Don't change your testosterone or start a DHT blocker based on the flag alone. First check the units, the lab's range, and the method. Then bring the result to your prescriber along with your PSA, your symptoms, and the actual problem you're worried about.

Six steps, in order:

Check the units. pg/mL, ng/dL, or nmol/L? Convert before you compare.
Check your lab's reference range. Use the one printed on your report, not one from a forum.
Ask what method was used. LC-MS/MS is more precise for DHT than older methods.
Compare with earlier results from the same lab, if you have them.
Name the real problem. Is it hair thinning? Urinary symptoms? A PSA change? Or just a flag with no symptoms? Each leads somewhere different.
Review it with the clinician who prescribes your testosterone. Don't treat the number yourself.

An isolated high serum DHT result can occur during TRT, especially with transdermal treatment. By itself, that lab flag is not an emergency and does not show what is happening inside your prostate or scalp; it still needs to be read in clinical context.

Should you take finasteride or dutasteride with TRT?

It's an option for specific indications, not a default response to a DHT lab flag. Finasteride and dutasteride lower DHT. Finasteride 1 mg is FDA-approved for male-pattern hair loss in men, while finasteride 5 mg and dutasteride are approved for benign prostatic hyperplasia. These drugs lower PSA readings, have important adverse-effect information in their labels, and there is no FDA-approved topical finasteride.

These drugs are called 5-alpha reductase inhibitors, or 5-ARIs. They block the enzyme that makes DHT.

DHT blocker decision table

TRT and DHT: conversion, format evidence, laboratory units, tissue context and DHT blockers table 7: DHT blocker decision table
Option	FDA status	What it does to DHT	Effect on PSA	Key warnings	Blood donation
Finasteride 1 mg (Propecia and generics)	FDA-approved for male pattern hair loss	Lowers scalp and blood DHT (blocks type 2)	Lowers PSA. In men 18–41, average PSA fell from 0.7 to 0.5 ng/mL at 12 months	Sexual side effects in a small share of men in trials. Depression and suicidal ideation are listed on current labeling. Pregnant women shouldn't handle crushed or broken tablets	Wait 1 month after last dose (American Red Cross)
Finasteride 5 mg (Proscar and generics)	FDA-approved for enlarged prostate (BPH)	Same mechanism, higher dose	Lowers PSA by about 50% in older men with BPH	Same class warnings	Wait 1 month
Dutasteride (Avodart and generics)	FDA-approved for BPH. Hair-loss use is off-label in the U.S.	Blocks both type 1 and type 2, so it lowers DHT further than finasteride	Lowers PSA	Same class warnings	Wait 6 months after last dose
Topical finasteride (compounded)	Not FDA-approved. FDA warned about it in April 2025	Absorbed into the bloodstream	Possible	FDA received 32 adverse-event reports from 2019 to 2024, many lasting after people stopped. Some patients said they'd been told a topical carried no risk	Ask the blood center

TRT and DHT: conversion, format evidence, laboratory units, tissue context and DHT blockers table 7: DHT blocker decision table: read as text

Finasteride 1 mg (Propecia and generics)

FDA status: FDA-approved for male pattern hair loss
What it does to DHT: Lowers scalp and blood DHT (blocks type 2)
Effect on PSA: Lowers PSA. In men 18–41, average PSA fell from 0.7 to 0.5 ng/mL at 12 months
Key warnings: Sexual side effects in a small share of men in trials. Depression and suicidal ideation are listed on current labeling. Pregnant women shouldn't handle crushed or broken tablets
Blood donation: Wait 1 month after last dose (American Red Cross)

Finasteride 5 mg (Proscar and generics)

FDA status: FDA-approved for enlarged prostate (BPH)
What it does to DHT: Same mechanism, higher dose
Effect on PSA: Lowers PSA by about 50% in older men with BPH
Key warnings: Same class warnings
Blood donation: Wait 1 month

Dutasteride (Avodart and generics)

FDA status: FDA-approved for BPH. Hair-loss use is off-label in the U.S.
What it does to DHT: Blocks both type 1 and type 2, so it lowers DHT further than finasteride
Effect on PSA: Lowers PSA
Key warnings: Same class warnings
Blood donation: Wait 6 months after last dose

Topical finasteride (compounded)

FDA status: Not FDA-approved. FDA warned about it in April 2025
What it does to DHT: Absorbed into the bloodstream
Effect on PSA: Possible
Key warnings: FDA received 32 adverse-event reports from 2019 to 2024, many lasting after people stopped. Some patients said they'd been told a topical carried no risk
Blood donation: Ask the blood center

Sources: Propecia prescribing information (rev. 8/2022); FDA alert on compounded topical finasteride (April 22, 2025); American Red Cross deferral criteria as summarized in the Merck Manual. Checked October 2026.

Does a DHT blocker cancel out TRT's benefits?

Blocking DHT did not erase several measured testosterone effects in these specific trials:

Dutasteride trial (Bhasin et al., JAMA, 2012). Healthy young men had their natural testosterone shut off, then got graded testosterone doses with either dutasteride or placebo for 20 weeks. Gains in lean mass didn't differ between the two groups. Neither did changes in strength, sexual function, fat mass, or hematocrit.
Finasteride trial (Borst et al., JCEM, 2014). Sixty men aged 60 and older with low testosterone got testosterone enanthate (125 mg a week, which is above typical replacement) with or without finasteride 5 mg for a year. Testosterone alone grew the prostate by 11.4 cm³. Finasteride completely prevented that growth, and men still got the gains in strength, bone density, and fat loss.
Gel plus dutasteride (Page et al., Journal of Urology, 2011). In older men with an enlarged prostate using testosterone gel, adding dutasteride lowered prostate volume and PSA compared with testosterone alone.

The caveats are real. These were specific groups (young men with shut-off testosterone, older men on a higher-than-usual dose, older men with BPH). They don't prove a DHT blocker is right for you, and they do not establish that DHT is unnecessary for every androgen effect. They show that blocking DHT did not erase several measured body-composition and performance effects of testosterone in those study populations.

What a DHT blocker does to your PSA reading

This matters more than most men realize. Finasteride lowers PSA, so your "normal" PSA isn't the same number anymore.

The Propecia label says to read it this way: any confirmed rise from your lowest PSA value while on the drug may signal prostate cancer and should be checked, even if it's still in the "normal" range. Make sure every clinician who orders your PSA knows you take a 5-ARI.

The blood-donation catch for men with high hematocrit

Here's the one almost nobody connects. TRT can raise hematocrit, and some men end up giving blood to bring it down. But finasteride and dutasteride trigger blood-donation waiting periods: 1 month after your last finasteride dose and 6 months after dutasteride, because of the risk to a pregnant recipient.

If you give blood to manage your hematocrit, tell your prescriber and the blood center before you start a DHT blocker. Ask about therapeutic phlebotomy (blood removal ordered by your doctor) as a separate option.

Does finasteride lower testosterone?

Finasteride does not work by lowering testosterone. It blocks conversion of testosterone to DHT, so serum DHT falls and serum testosterone may stay similar or rise modestly.

If you feel down or have thoughts of harming yourself on any medication, contact your prescriber right away. If you're in crisis, call or text 988 to reach the Suicide & Crisis Lifeline.

When should you use an online TRT clinic versus a local specialist?

DHT by itself does not decide whether online or local care is better. If your main issue is a routine TRT follow-up question and you already have an established prescriber, start there. If you have a prostate-cancer history or concerning prostate findings, significant urinary symptoms, near-term fertility goals, an unusual hormone pattern, or another complex endocrine problem, primary care, urology, reproductive urology, or endocrinology may be the better care route.

Use TRT Provider Guide's Find My TRT Path tool if you are not sure which care route fits your situation. The tool is educational and non-diagnostic.

What to ask your clinician about DHT

Six questions cover almost everything: which format and where to apply it, whether to test DHT and PSA at baseline, the plan if shedding starts, whether a DHT blocker fits your history, how it changes your PSA reading, and how it affects blood donation.

Copy these into your phone before your next visit:

"Which format are you recommending, and where exactly should I apply it?"
"Do you have a clinical reason to check DHT in my case, and what standard TRT monitoring do I need?"
"If I notice hair thinning, what's the plan: switch formats, see a dermatologist, or something else?"
"Would finasteride or dutasteride make sense for me, given my history? Is the version you'd prescribe FDA-approved?"
"If I take a DHT blocker, how will you read my PSA from now on?"
"If my hematocrit runs high, how will we handle that while I'm on a DHT blocker?"

Get these questions matched to your situation.

Find My TRT Path turns your format preference, fertility plans, state, and budget into a care-route recommendation and a question list for your next appointment.

Build my TRT question list →

TRT and DHT: frequently asked questions

Does TRT increase DHT?

Yes. TRT raises testosterone, and some of it is converted to DHT. In a 32-study review, transdermal gel/patch therapy raised serum DHT more than intramuscular injection on average.

How much testosterone converts to DHT?

Tracer studies in healthy men found roughly 4% to 6% of circulating testosterone is converted to DHT. Blood DHT normally runs about one-tenth of total testosterone.

Do testosterone injections increase DHT?

Yes. Across 32 studies, intramuscular injections raised serum DHT about 2.2-fold on average, versus about 5.5-fold for the pooled transdermal gel/patch group.

Is testosterone cream worse for hair than injections?

Scrotal testosterone application can produce high serum DHT, but the 32-study 5.5-fold estimate was for pooled gel/patch therapy, not every compounded cream. Hair effects still depend on follicle susceptibility and cannot be predicted from serum DHT alone.

What is a normal DHT level for a man?

Mayo Clinic Laboratories lists 112–955 pg/mL (11.2–95.5 ng/dL) for adult men. Ranges vary by lab, so use the one on your report. There's no guideline "target" DHT on TRT.

Does high DHT on TRT mean my prostate is at risk?

Not by itself. Blood DHT does not directly measure prostate DHT, and TRAVERSE found no significant difference in high-grade prostate cancer between testosterone and placebo in carefully screened men. Prostate monitoring follows age, risk, PSA context, symptoms, and guideline-based clinical assessment.

Can I take finasteride while on TRT?

Some men do, under a clinician's care. It can slow hair loss and limit prostate growth, but it lowers PSA readings and its label lists sexual and mood side effects.

Does finasteride lower testosterone?

No. It lowers DHT. Testosterone usually stays the same or rises slightly.

Does DHT cause breast swelling on TRT?

DHT is not the usual explanation for breast tenderness or gynecomastia during TRT. Estradiol and other causes are considered separately, so breast symptoms should be assessed on their own rather than treated as a DHT problem.

Is topical finasteride FDA-approved?

No. There's no FDA-approved topical finasteride. The FDA warned about compounded topical versions in April 2025.

Should DHT be tested routinely on TRT?

Major TRT guidelines don't require routine DHT testing for everyone. A clinician may order it when it answers a specific endocrine, medication, or specialist question.

Can I donate blood while taking finasteride or dutasteride?

Not right away. The American Red Cross asks donors to wait 1 month after finasteride and 6 months after dutasteride.

How we researched this page

We built this page from primary sources: FDA drug labels and safety communications, the Endocrine Society's testosterone guideline, peer-reviewed trials and reviews, and Mayo Clinic Laboratories' test catalog.

We label provider claims as provider-stated, and our recommendations as our own editorial judgment. Online forums helped us understand the questions men ask. They weren't used as evidence for any medical claim.

This page is editorial research using public sources. It has not been clinically reviewed.

Key sources:

Borst SE et al. Cardiovascular risks and elevation of serum DHT vary by route of testosterone administration: a systematic review and meta-analysis. BMC Medicine, 2014.
Endocrine Reviews (2017): review of DHT biochemistry, physiology, and clinical implications of elevated blood levels.
Page ST et al. Dihydrotestosterone administration does not increase intraprostatic androgen concentrations or alter prostate androgen action in healthy men. JCEM, 2011.
Bhasin S et al. Effect of testosterone supplementation with and without a dual 5α-reductase inhibitor on fat-free mass. JAMA, 2012.
Borst SE et al. Musculoskeletal and prostate effects of combined testosterone and finasteride administration in older hypogonadal men. JCEM, 2014.
Page ST et al. Dutasteride reduces prostate size and PSA in older hypogonadal men with BPH undergoing testosterone replacement therapy. Journal of Urology, 2011.
Bhasin S et al. Prostate safety events during testosterone replacement therapy (TRAVERSE). JAMA Network Open, 2023.
Bhasin S et al. Testosterone therapy in men with hypogonadism: an Endocrine Society clinical practice guideline, 2018.
Ito T, Horton R. The source of plasma dihydrotestosterone in man. Journal of Clinical Investigation, 1971.
Coviello AD/Bhasin S et al. Effects of injected testosterone dose and age on the conversion of testosterone to estradiol and DHT. JCEM, 2010.
Ahmed SR et al. Transdermal testosterone therapy in the treatment of male hypogonadism (scrotal patch).
Iyer R et al. Pharmacokinetics of testosterone cream applied to scrotal skin. Andrology, 2017.
AndroGel 1% prescribing information; Propecia prescribing information (rev. 8/2022); AndroForte 5 data sheet (Medsafe, New Zealand).
FDA. Potential risks associated with compounded topical finasteride products (April 22, 2025).
Mayo Clinic Laboratories. Test DHTS: Dihydrotestosterone, Serum.
American Red Cross donor eligibility criteria (via Merck Manual Professional).
DEA. Drug Scheduling — testosterone is listed as Schedule III.
American Red Cross. Medication-related blood-donation waiting periods.

Read our Editorial Standards and Corrections policy. Spot something out of date? Tell us and we'll re-verify it.

The bottom line on TRT and DHT

TRT can raise DHT. Treatment format and application site can affect how much serum DHT rises, but they are not the only factors. And the number in your blood isn't a direct readout of what's happening in your scalp or prostate.

If hair or prostate health matters to you, discuss treatment format and the right monitoring for your situation before reacting to a DHT number. Use a DHT blocker only for a clear clinical reason with a clinician.

Still not sure which TRT care route fits you? Use our free Find My TRT Path tool.

This page is educational information, not medical advice. It doesn't diagnose low testosterone, interpret your lab results, or recommend a dose. Testosterone is a Schedule III controlled substance in the United States and requires a valid prescription. Provider prices and policies change; every provider figure on this page is dated to the day we checked it.