TRT and Diabetes: What Testosterone Can—and Can't—Do for Type 2 Diabetes
Affiliate disclosure: TRT Provider Guide may earn compensation through certain provider links. Commercial relationships do not change our editorial conclusions. Full disclosure.
TRT and diabetes, short answer: testosterone replacement therapy is not a diabetes treatment. In the 5,204-man TRAVERSE diabetes study, TRT did not improve A1c or fasting glucose and did not significantly prevent prediabetes from progressing to diabetes. If low testosterone is properly diagnosed, diabetes itself is not an automatic reason to rule TRT out.
So the real question isn't "will TRT fix my blood sugar?" It's "what changes for me if I start it?"
That part almost nobody explains. Here's what changes the answer:
- On insulin? Current testosterone labeling says androgens may lower blood glucose and insulin requirements in some diabetic patients. Do not change insulin on your own; make sure the clinician managing your diabetes knows before TRT starts.
- On Jardiance, Farxiga, or another SGLT2 inhibitor? Both SGLT2 inhibitors and testosterone can raise hematocrit. In a large retrospective VA cohort, using both was associated with higher odds of hematocrit above 54% than either treatment alone.
- Tracking your diabetes with A1c? Changes in red-blood-cell lifespan or turnover can make A1c disagree with your actual glucose. Testosterone changes red-cell production, but it has not been shown to routinely cause a falsely low A1c. If A1c and your meter or CGM stop matching, flag the mismatch for your diabetes clinician.
- Want kids in the next few years? Testosterone can shut down sperm production. Talk to a fertility-aware clinician first.
- Haven't had two early-morning testosterone tests? Get tested properly before you pick any program.
This page is for you if: you have type 2 diabetes, prediabetes, or insulin resistance, and you're wondering whether low testosterone or TRT changes your care.
This page can't help with: adjusting your insulin, reading your own lab results, or a diabetes emergency. Very high or very low blood sugar with confusion, vomiting, or trouble breathing is an emergency. Call 911.
Find your answer fast
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.
Educational information, not medical advice. Never start, stop, or change testosterone or a diabetes medicine without your clinician.
Does TRT help type 2 diabetes?
Not as a diabetes treatment. In the TRAVERSE Diabetes Study, testosterone gel did not lower A1c or fasting glucose, did not put diabetes into remission, and did not significantly slow prediabetes from turning into diabetes compared with placebo. The Endocrine Society recommends against using testosterone to improve blood sugar control in men with type 2 diabetes.
That's the honest answer. It may not be the one you hoped for.
You've probably read that TRT "improves insulin sensitivity" or "lowers A1c." Some clinic blogs say it flat out. Those claims usually lean on small, older studies. The largest contemporary randomized trial points the other way.
TRAVERSE ran at 316 U.S. sites. It randomly assigned men with diagnosed hypogonadism to testosterone gel or placebo gel. Hypogonadism means symptoms or signs consistent with testosterone deficiency plus consistently low testosterone confirmed with appropriate testing. Of the 5,204 men in the diabetes analysis, 1,175 had prediabetes and 3,880 had diabetes.
Here's what happened:
- Prediabetes → diabetes: no significant difference between testosterone and placebo.
- Diabetes remission: no difference.
- A1c and fasting glucose: changed about the same in both groups.
The researchers concluded that TRT alone should not be used to prevent or treat diabetes in men with hypogonadism. The Endocrine Society's guideline already said the same thing: it recommends against testosterone as a way to improve glycemic control in men with type 2 diabetes and low testosterone. The American Diabetes Association's 2026 Standards of Care also recommends against testosterone therapy for prevention of type 2 diabetes in men with hypogonadism.
One fair detail. In TRAVERSE, numerically fewer men on testosterone progressed to diabetes. At 24 months it was 10.1% vs 14.6%. But the overall difference was not statistically significant. In plain words, the trial did not establish a preventive effect.
So why do some articles say TRT improves diabetes?
Because some studies really did find good results. Nobody made those up. The mistake is acting like every trial studied the same men, gave the same treatment, and measured the same thing. They didn't.
We lined up the five bodies of evidence people cite most. Same columns, side by side. This is the table we wish had existed when we started researching this page.
What the trials actually found: TRT and blood sugar
Sources: TRAVERSE Diabetes Study, TRAVERSE cardiovascular-safety trial, T4DM, TIMES2, Gianatti 2014, and the 2026 systematic review. Compiled by TRT Provider Guide, October 2026.
Look at the Gianatti row for a second. Men on testosterone lost fat and gained muscle, yet their blood sugar didn't improve. That's the trap in a nutshell. Better body composition and a better A1c are not the same outcome.
Why the bigger trials matter more
Older claims that TRT "fixed" diabetes often come from observational registries. In those, men were not randomly assigned, and other things changed at the same time. Their weight changed. Their diabetes medicines changed. Their habits changed. That makes cause and effect much harder to separate.
A randomized placebo-controlled trial removes much of that bias. The ADA's 2026 Standards specifically weighs the favorable T4DM result against TRAVERSE's null result and does not recommend testosterone for diabetes prevention.
Here's the upside of all this. If TRT won't fix your blood sugar, you can judge it on what it's actually for. That means treating the symptoms of confirmed low testosterone. And the biggest heart-safety trial ever run on TRT was done mostly in men like you, men with diabetes. We'll get to what it found.
If blood sugar or weight is your main goal, start somewhere else. Diabetes medicines, a structured lifestyle program, and GLP-1 drugs have much stronger evidence. See TRT and GLP-1 and TRT and weight loss.
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.
Why do so many men with diabetes have low testosterone?
Men with type 2 diabetes have lower testosterone on average, but the exact prevalence of low testosterone varies a lot by study definition and population. One 103-man study found 33% met its hypogonadism definition; a 580-man study found low total testosterone in 43% and low calculated free testosterone in 57%. The ADA notes that obesity is a major confounder.
You're not imagining the link. It's one of the most consistent findings in men's endocrinology.
- In a 103-man study, 33% met the study's definition of hypogonadism.
- In a cross-sectional study of 580 men with type 2 diabetes, 43% had low total testosterone and 57% had low calculated free testosterone under that study's definitions.
- Those percentages should not be turned into a universal prevalence estimate. Assays, cutoffs, obesity, age, illness, and whether total or free testosterone is used all change the result.
Two quick definitions help here. Total testosterone is all the testosterone in your blood. Free testosterone is the small share circulating unbound to proteins.
In the 103-man study, the pattern was often secondary or hypogonadotropic: LH and FSH were low or inappropriately normal rather than clearly elevated. Luteinizing hormone (LH) and follicle-stimulating hormone (FSH) help clinicians distinguish a testicular problem from a pituitary-hypothalamic pattern when low testosterone is confirmed.
Is it just weight? Partly. The ADA's 2026 Standards note that testosterone is lower in men with diabetes, and that obesity is a major confounder. A confounder is a hidden factor that muddies the comparison. But in that study, body mass index explained only part of the variation in free testosterone. That does not prove diabetes itself caused the lower testosterone; the data were cross-sectional and other metabolic factors can travel together.
Why this matters to you: if you're young and have type 2 diabetes, low T and fertility questions may land on you sooner than you'd expect. Keep that in mind when we get to fertility below.
Does low testosterone cause insulin resistance, or does diabetes lower testosterone?
The relationship may run both ways, but causation is not settled. Low testosterone is associated with obesity and insulin resistance, while obesity and metabolic illness can also suppress testosterone. That helps explain why weight loss can improve testosterone in some men—and why raising testosterone does not automatically improve diabetes.
Think of it as overlapping systems, not a simple one-way cause.
Insulin resistance means your cells do not respond normally to insulin, so the body needs more insulin to manage glucose. Obesity, sleep problems, chronic illness, medications, and changes in SHBG can all affect testosterone measurements or symptoms at the same time.
The research backs both directions:
- Observational studies link lower testosterone with more insulin resistance, but association does not prove which one caused the other.
- In a small randomized trial of men with type 2 diabetes and secondary hypogonadism, testosterone improved clamp-measured insulin sensitivity over 24 weeks.
- The 2026 systematic review found favorable but heterogeneous effects on insulin resistance and very-low-certainty evidence for A1c and fasting glucose.
That insulin-sensitivity result is real. But it came from a small, short trial and does not establish long-term A1c or diabetes benefit. The larger TRAVERSE diabetes study did not show improved glycemic control.
The numbers on your lab report aren't interchangeable
Three tests get mixed up all the time:
When a clinic says TRT "improves insulin resistance," ask which number it means. A better HOMA-IR doesn't promise a better A1c.
One more thing. Metformin is a diabetes medicine, not a treatment for testosterone deficiency. Do not start, stop, or change it for a hormone goal.
If substantial weight loss is underway, including with a GLP-1-based medicine, ask your clinician whether repeat testosterone testing after weight stabilizes would change the decision. The Endocrine Society's July 2026 statement says weight loss is typically first-line when appropriately diagnosed low testosterone appears related to overweight or obesity and no other cause is found.
Should men with diabetes get their testosterone checked?
If you have symptoms like low sex drive or erection problems, yes. The American Diabetes Association advises asking men with diabetes about sexual health, and checking a morning total testosterone when symptoms or signs of low testosterone are present. A diagnosis needs those symptoms plus consistently low results on repeat early-morning tests.
The big medical groups don't all say the same thing, so here's each one straight:
Our take: if you have diabetes and symptoms, getting tested is reasonable under every one of these. Without symptoms, it's a conversation with your clinician, not a must.
How to get tested the right way
- Test early in the morning, while fasting. Testosterone runs highest in the morning, and eating can lower it.
- Test on two separate days. One low number isn't a diagnosis. Levels bounce around.
- Ask whether free testosterone and SHBG are useful if total testosterone is near the lower limit or SHBG may be altered. SHBG (sex hormone-binding globulin) binds testosterone and can be lower with obesity and diabetes. The ADA says free testosterone can be reasonable when total testosterone is close to the lower limit.
- Expect LH and FSH if the result is low. They show why testosterone is low, which shapes treatment and fertility options.
- Don't treat 300 as a magic line. The AUA calls a total testosterone below 300 ng/dL a "reasonable cut-off" in support of a diagnosis, with symptoms and two morning tests. It's not a diagnosis by itself.
More detail: how low-testosterone testing works and what you actually have to prove for TRT.
Have you had two early-morning, fasting testosterone tests?
Yes → skip ahead to your diabetes meds on TRT. No or not sure → that's your next step, and it's a normal one.
Diabetes changes the questions, not automatically the answer. If you're not sure your low T has been properly tested, or which clinician should do it, TRT Provider Guide's Find My TRT Path tool maps your situation to a care route. You also get the questions to ask before you pay anyone.
Map My TRT Care Route → Free · no sign-up · educational only. It doesn't diagnose low testosterone, read your labs, or guarantee a prescription.
Can you take TRT if you have diabetes?
Diabetes itself is not listed as a contraindication to testosterone therapy, but that does not make TRT automatically appropriate. The large TRAVERSE cardiovascular-safety trial found testosterone was noninferior to placebo for major cardiovascular events in men with hypogonadism and existing or high cardiovascular risk, while pulmonary embolism, atrial fibrillation, and acute kidney injury were more common in the testosterone group.
This is the fear we hear most: "I already have diabetic heart risk. Will testosterone make it worse?"
The best randomized safety data we have is reassuring for the trial's primary major cardiovascular endpoint, not a guarantee of zero cardiovascular risk. The parent TRAVERSE trial studied men with existing cardiovascular disease or high cardiovascular risk. Testosterone was noninferior to placebo for cardiovascular death, nonfatal heart attack, and nonfatal stroke. The FDA then required class-wide labeling changes in 2025, removing boxed-warning language about increased major cardiovascular outcomes and adding blood-pressure information. The FDA issued additional testosterone-label updates in 2026.
That's reassuring. It is not "risk-free." In TRAVERSE, the testosterone group had a higher incidence of pulmonary embolism, atrial fibrillation, and acute kidney injury than the placebo group.
Reasons to pause or start with a specialist
The Endocrine Society recommends against starting testosterone in men who have any of these:
- Plans to father a child soon. Testosterone can suppress spermatogenesis, your body's sperm production.
- Elevated hematocrit. Hematocrit is the share of your blood made of red blood cells. Too high, and the blood gets thicker.
- Untreated severe obstructive sleep apnea. This is common with obesity and type 2 diabetes. Get screened if you snore hard or wake up exhausted.
- A heart attack or stroke in the last 6 months, or uncontrolled heart failure.
- Breast or prostate cancer, a prostate nodule, or a high PSA without a urology workup. PSA (prostate-specific antigen) is a blood marker for prostate health.
- Severe urinary symptoms or thrombophilia (a tendency to form clots).
Kidney disease is not one of the Endocrine Society's listed absolute no-start conditions, but renal disease can complicate fluid balance and overall risk. If you have chronic kidney disease, keep the clinician managing it in the conversation.
Our editorial view: if your diabetes is not meeting treatment goals, prioritize coordinated diabetes care while the testosterone question is evaluated. That is a care-route judgment, not a universal contraindication to TRT.
Full list: who should not take TRT.
How does TRT affect your diabetes medicines?
Current testosterone labeling says androgens may lower blood glucose and insulin requirements in some diabetic patients. Separately, observational data show higher odds of erythrocytosis when testosterone and an SGLT2 inhibitor are used together. Those are reasons for coordinated monitoring—not reasons to change diabetes medicine on your own.
This is the section most pages skip. It's also the one that matters most if you take more than metformin.
Current DailyMed testosterone labeling includes a drug-interaction section titled "Insulin." It says changes in insulin sensitivity or glycemic control may occur and that androgens may decrease blood glucose and insulin requirements in diabetic patients.
Do not lower your insulin or any diabetes medicine on your own because you started TRT. That decision belongs to the clinician managing your diabetes. Tell them before your first dose.
Your diabetes meds on TRT: what to watch
Compiled by TRT Provider Guide from FDA-approved testosterone labeling and published studies, October 2026. Educational only. Not dosing advice.
Insulin and medicines that can cause lows: coordinate the plan
Low blood sugar can show up as shakiness, sweating, a racing heart, sudden hunger, confusion, or irritability. The testosterone label specifically warns that insulin requirements may decrease in some diabetic patients. If you use insulin—or another medicine that can cause hypoglycemia—make sure the clinician managing your diabetes knows TRT is starting and knows how you normally monitor glucose. Do not change a diabetes dose on your own.
Jardiance, Farxiga, and other SGLT2 inhibitors: watch your hematocrit
This one surprises people. SGLT2 inhibitors are great drugs for the heart and kidneys, and many men with diabetes take them. But they nudge your red blood cell count up, and so does testosterone.
In the VA cohort, combined use was associated with 3.80× the adjusted odds of new hematocrit over 54% compared with SGLT2-inhibitor use alone and 2.49× the adjusted odds compared with TRT alone. Erythrocytosis means an abnormally high red-blood-cell mass. A separate case series also reported erythrocytosis after SGLT2-inhibitor treatment was added in men already using testosterone.
These studies do not prove that everyone on both treatments will develop erythrocytosis. They support making hematocrit monitoring an explicit question for both prescribers.
Ozempic, Mounjaro, and GLP-1s
Current testosterone labeling reviewed for this page does not list a specific GLP-1 interaction. The bigger question is timing. If a GLP-1-based medicine is producing major weight loss, ask whether the metabolic change should prompt repeat testosterone testing before a long-term TRT decision. Our TRT and GLP-1 guide covers this in depth.
Metformin
No metformin-specific interaction is listed in the testosterone labeling reviewed for this page. TRT does not replace metformin or another prescribed diabetes treatment. Keep taking your diabetes medicines as prescribed unless your clinician changes them.
Want this table turned into your own list? Check off the medicines you take. You'll get the exact questions for your TRT prescriber and your diabetes clinician, ready to print or save.
Build My TRT + Diabetes Checklist → 30 seconds · nothing to sign up for · educational only
Can TRT make A1c disagree with your real blood sugar?
A1c can become misleading when red-blood-cell lifespan or turnover changes, but current evidence does not show that TRT routinely makes A1c falsely low. Testosterone changes red-cell production, and a published case described A1c that underestimated glucose exposure in a testosterone-treated patient. If A1c and your meter or CGM disagree, the mismatch deserves review.
Here's the simple version. A1c reflects how much glucose has attached to hemoglobin over the life of red blood cells. NIDDK notes that conditions that change red-blood-cell lifespan can change A1c results. Testosterone is well known to raise hemoglobin and hematocrit in some men, but its effect on red-cell lifespan is more complicated than "newer cells always make A1c low." A 2024 study found testosterone can transiently change erythrocyte lifespan and said the longer-term effect needs more study.
One published case illustrates the possible mismatch. A patient with diabetes who was receiving testosterone had a hematocrit of 56% and A1c around 6.2–6.4%, while CGM data suggested higher average glucose. One case cannot establish how often this happens or prove testosterone was the only cause.
What to do with this:
- Compare A1c with your home meter or CGM if the numbers seem inconsistent.
- If they do not match, ask your diabetes clinician whether another glycemic measure is useful.
- Make sure the clinician interpreting your A1c knows about testosterone use, hematocrit, kidney disease, anemia, blood loss, transfusion, or other factors that can affect red cells.
Will TRT fix diabetes-related erectile dysfunction?
Usually not by itself. Erection problems in diabetes often come from damage to blood vessels and nerves, which testosterone doesn't repair. In men with confirmed low testosterone, TRT may help sex drive. But low libido and erectile dysfunction are different problems, and ED often needs its own treatment.
This trips up a lot of men, so let's separate the two:
- Low libido means low desire. You're just not interested. This is the symptom most tied to low testosterone.
- Erectile dysfunction (ED) means trouble getting or keeping an erection, even when you want to. In diabetes, this often comes from blood flow and nerve damage.
You can have one, the other, or both. A normal testosterone result doesn't rule out diabetic ED. A low one doesn't mean TRT will fix it.
The ADA's 2026 Standards recommend screening men with diabetes or prediabetes for ED, especially when cardiovascular risk is high. ED can also signal vascular disease, which is another reason it belongs in regular diabetes care rather than only in a TRT clinic.
If ED is your main concern, see online TRT options for erectile dysfunction. There, testosterone and ED medicines are covered as separate tools.
Can TRT stop prediabetes from turning into diabetes?
Not reliably. TRAVERSE found no significant reduction in progression. The Australian T4DM trial found fewer new cases only when testosterone was added to a structured lifestyle program, in men who were not diagnosed with hypogonadism. The ADA's 2026 Standards do not recommend testosterone to prevent type 2 diabetes.
T4DM is the study you'll see quoted as "testosterone cuts diabetes risk by 41%." The number is real. The context matters.
Sources: T4DM (PubMed), ADA 2026 Standards, Section 3, TRAVERSE Diabetes abstract.
Two very different experiments. Two very different answers. The ADA notes the T4DM benefit "was observed only when added to a structured lifestyle program," and weighs TRAVERSE's null result. Its conclusion: don't use testosterone to prevent diabetes.
What the ADA does recommend for people at high risk: an evidence-based diabetes-prevention lifestyle program, with metformin considered for selected higher-risk adults. Other pharmacotherapy can be used for person-centered goals such as weight management and reducing progression of hyperglycemia, but it should not be collapsed into a blanket "diabetes prevention drug" claim. See the ADA 2026 prevention section.
Notice the T4DM safety number too. More than 1 in 5 men on testosterone hit the hematocrit safety limit. That's why monitoring is the next section.
What monitoring should a man with diabetes expect on TRT?
Expect standard TRT follow-up such as testosterone, hematocrit, symptom/adverse-effect review, blood pressure, and prostate monitoring when appropriate, alongside normal diabetes care. If you use insulin, coordinate glucose monitoring; if you use an SGLT2 inhibitor, ask whether the combined erythrocytosis signal changes hematocrit follow-up; if A1c and glucose data disagree, flag the mismatch.
Here's the timeline the Endocrine Society and FDA labeling point to, with the diabetes add-ons layered on.
Based on the Endocrine Society guideline and current FDA testosterone information. Exact follow-up depends on the product, the patient's risks, and the clinician's plan.
The biggest risk here isn't a missing test. It's two prescribers who never talk. Your TRT prescriber may never see your A1c. Your diabetes doctor may not know your hematocrit. Bring results both ways. The checklist builder below gives you a one-page handoff sheet for exactly that.
More detail: TRT safety and monitoring.
TRT + Diabetes Checklist Builder
Turn everything above into a list that's about you. Pick what applies. You'll get the questions for your TRT prescriber, the questions for your diabetes clinician, the monitoring items to confirm before you pay, and a suggested care route. Print it or save it as a PDF.
Your choices stay in this page only. They are not saved or sent to a server. Leaving or reloading clears them.
General TRT + Diabetes Checklist
Suggested care route
Start with primary care, urology, or endocrinology to review symptoms and appropriate repeat morning testosterone testing. Keep diabetes care going separately.
Questions for your TRT prescriber
- How was low testosterone confirmed, and do repeat early-morning tests, free testosterone or SHBG, LH and FSH need review?
- What is the cause, how do fertility plans affect the decision, and what exact product and follow-up would be appropriate?
- Who shares results with my diabetes clinician and who can I contact between visits?
Questions for your diabetes clinician
- How will we keep diabetes treatment and monitoring coordinated with the testosterone evaluation?
- If A1c disagrees with my meter or CGM, what should we review and which glycemic measure should guide care?
Monitoring items to confirm
- Confirm diagnosis, fertility plans, hematocrit, blood pressure, sleep-apnea risk and prostate assessment when appropriate.
- Confirm the product-specific follow-up plan, including the 3–6-month reassessment and continuing diabetes monitoring.
Never change insulin, another diabetes medicine, or testosterone on your own. For very high or very low blood sugar with confusion, vomiting, or trouble breathing, call 911.
Example: if you check SGLT2 and insulin, your list includes: "Does using an SGLT2 inhibitor change how often you want my hematocrit checked?" and "Who reviews my insulin if my glucose readings change after TRT starts?"
The checklist is educational. It doesn't diagnose low testosterone, interpret lab results, recommend a dose, or decide whether you qualify for treatment.
Online TRT clinic or your diabetes doctor: which care route fits?
If your diabetes treatment is complex, you have chronic kidney or cardiovascular disease, or you had a heart attack or stroke within the past 6 months, start with the clinicians already managing those risks. If low testosterone is properly confirmed and online care still fits, compare programs on diagnostic quality, hematocrit monitoring, clinician access, medication transparency, and coordination—not on promises to improve diabetes.
Here's where your situation points:
These are editorial care-route judgments based on current guidelines and the evidence on this page. They are not medical eligibility decisions.
If online care still looks appropriate after low testosterone is properly confirmed, use TRT Provider Guide's Find My TRT Path tool to compare the care routes that fit your testing status, fertility plans, insurance, state, and treatment preferences before you compare individual clinics.
Map My TRT Care Route →
Free · no sign-up · educational only. It does not diagnose low testosterone, interpret your labs, determine medical eligibility, or guarantee a prescription.
A note on online prescribing: testosterone is a Schedule III controlled substance and requires a valid prescription. DEA and HHS have extended the current federal telemedicine flexibilities for prescribing Schedule II–V controlled medications through December 31, 2026, when the federal requirements and applicable state law are met. State rules still apply, and an in-person evaluation may still be required in some situations. See the DEA's current notice and our online vs local TRT care guide.
Does insurance cover TRT if you have diabetes?
Having diabetes does not automatically make TRT covered. Coverage rules vary by plan and product; many policies require documented testosterone deficiency, repeat morning testing, symptoms or signs, and prior authorization. Check the actual plan policy rather than treating diabetes itself as a coverage shortcut.
Diabetes is relevant to evaluation, not automatic coverage. The ADA's 2026 Standards recommend morning total-testosterone testing when men with diabetes or prediabetes have symptoms or signs of hypogonadism. The AUA also identifies diabetes as a condition in which clinicians should consider measuring testosterone. Neither recommendation guarantees that an insurer will cover treatment.
If you've been denied, see testosterone prior authorization. Plan-specific guides: Aetna, Blue Cross Blue Shield, Cigna, UnitedHealthcare, Medicare, Medicaid, Kaiser, TRICARE, and the VA.
Does any of this apply to type 1 diabetes?
Only partly. The major diabetes/TRT trials on this page do not establish the same conclusions for type 1 diabetes. In one cross-sectional study, low total testosterone was less common in type 1 than type 2 diabetes, but general hypogonadism diagnostic principles still apply. Because insulin is essential in type 1 diabetes, coordinate any TRT decision with the clinician managing your insulin.
In the Australian diabetes study, only 7% of men with type 1 diabetes had low total testosterone. But about 20% had low calculated free testosterone, similar to men with type 2.
The insulin warning in current testosterone labeling is directly relevant because insulin is part of type 1 diabetes treatment. Do not extrapolate type 2 diabetes trial outcomes to type 1 diabetes; coordinate the decision and glucose monitoring with your endocrinology team.
How we researched this page
We built this page to answer one question well: what does diabetes change about the TRT decision?
Sources we used, in order of weight: FDA-approved testosterone labeling and FDA safety communications; clinical guidelines from the Endocrine Society, the American Urological Association, and the American Diabetes Association (2026 Standards of Care); randomized controlled trials (TRAVERSE, T4DM, TIMES2, Gianatti 2014) and a 2026 systematic review; observational studies for prevalence and the SGLT2 signal, labeled as such; and official provider pages for program facts.
How we separate claims: verified facts, provider-stated facts, and our editorial conclusions are kept apart, following How We Review TRT Providers. The evidence table and the diabetes-medicine table were compiled by TRT Provider Guide from the cited sources. The provider comparison uses published panels and prices, with dates.
What we didn't do: diagnose anyone, review personal lab results, enroll in any program, or test treatment. This page has not been clinically reviewed.
Found something out of date? Send it through our corrections process. We re-verify and date every change. See also our editorial standards and privacy policy.
TRT and diabetes: frequently asked questions
Does testosterone raise or lower blood sugar?
In men with diabetes, FDA-approved testosterone labels warn that testosterone may lower blood sugar and reduce insulin needs. In the large TRAVERSE trial, though, average A1c and fasting glucose didn't change compared with placebo. Individual responses vary. That's why glucose monitoring matters when you start, especially on insulin or a sulfonylurea.
Does TRT lower A1c?
Don't count on it. TRAVERSE found no A1c improvement in men with hypogonadism and diabetes. Some smaller trials found modest changes, but the 2026 systematic review rates glycemic evidence as very uncertain. If your A1c changes sharply and does not match your meter or CGM, ask your diabetes clinician about the mismatch rather than assuming TRT caused the change.
Does low testosterone cause diabetes?
Low testosterone and type 2 diabetes are strongly linked, and the relationship seems to run both ways. Low testosterone is tied to more belly fat and insulin resistance, while obesity and insulin resistance push testosterone down. That link doesn't mean raising testosterone will reverse diabetes. Trials like TRAVERSE show it doesn't, on its own.
Can I take TRT with metformin?
Current testosterone labeling reviewed for this page does not list a metformin-specific interaction. That does not prove there can never be an interaction in an individual patient, and TRT does not replace metformin. Keep taking your diabetes medicines exactly as prescribed unless your clinician changes them.
Is it safe to take testosterone with Jardiance or Farxiga?
The combination is not automatically prohibited, but observational data show an erythrocytosis signal. In a large VA cohort, combined SGLT2-inhibitor plus TRT use was associated with 2.49 times the adjusted odds of hematocrit over 54% compared with TRT alone. Ask both prescribers whether that changes your hematocrit-monitoring plan.
Can I take TRT and Ozempic or Mounjaro together?
Current testosterone labeling reviewed for this page does not list a specific GLP-1 interaction. The bigger question is timing: substantial weight loss can change the metabolic context in which low testosterone was measured. Ask whether repeat testing after major weight change would affect the TRT decision. Our TRT and GLP-1 guide covers this in depth.
Will TRT reduce how much insulin I need?
It might in some patients, but do not expect or plan on it. Current testosterone labeling says androgens may decrease blood glucose and insulin requirements in diabetic patients. Never cut insulin on your own; make sure the clinician managing your diabetes knows TRT is starting and reviews any meaningful change in glucose readings.
Is TRT safe for my heart if I have diabetes?
In TRAVERSE, which enrolled men with or at high risk of heart disease, testosterone did not increase heart attacks, strokes, or cardiovascular deaths compared with placebo. It did raise rates of venous blood clots, atrial fibrillation, and acute kidney injury. A heart attack or stroke in the last 6 months is a reason not to start, per the Endocrine Society.
Should my diabetes doctor check my testosterone?
If you have symptoms or signs of hypogonadism, the ADA recommends screening with a morning total testosterone level. The AUA also says clinicians should consider measuring testosterone in men with diabetes. A testosterone-deficiency diagnosis still requires the clinical picture plus consistently low values confirmed with appropriate repeat morning testing.
Can TRT reverse prediabetes?
Not reliably. TRAVERSE found no significant reduction in prediabetes turning into diabetes. T4DM found fewer cases only when testosterone was added to a structured lifestyle program, in men without diagnosed hypogonadism. The ADA's 2026 Standards do not recommend testosterone to prevent type 2 diabetes.
Can TRT replace metformin or insulin?
No. TRT treats confirmed low testosterone. It is not a diabetes medicine, and stopping or cutting a diabetes medicine because you started testosterone can be dangerous. Your diabetes treatment continues separately.
Does insurance cover TRT if I have diabetes?
Diabetes alone does not guarantee coverage. Requirements vary by plan and product, and many policies require documented testosterone deficiency, repeat morning testing, symptoms or signs, and prior authorization. Check the actual plan policy and pharmacy benefit before assuming what will be covered.
I have type 1 diabetes. Can I take TRT?
Possibly, if testosterone deficiency is properly diagnosed and treatment is appropriate. The major diabetes/TRT trials discussed here were not designed to answer the question for type 1 diabetes. Because insulin is essential in type 1 diabetes and current testosterone labeling warns that insulin requirements may change, coordinate any TRT decision with your endocrinology team.
The bottom line
TRT isn't a diabetes drug, and the best current randomized evidence does not show a reliable A1c benefit. If testosterone deficiency is properly confirmed, diabetes itself does not automatically shut the door. It changes the coordination questions: insulin and glucose monitoring, hematocrit if you also use an SGLT2 inhibitor, and whether A1c matches your actual glucose data.
Get tested the right way. Bring your medicine list to whoever prescribes. Make sure your TRT prescriber and your diabetes clinician see each other's numbers.
Still not sure which TRT care route fits you? Use our free Find My TRT Path tool.
Find My TRT Path is educational and non-diagnostic. It doesn't confirm low testosterone, determine medical eligibility, guarantee a prescription, or replace a clinician.
TRT Provider Guide is the independent decision resource for testosterone replacement therapy care. We are not a clinic, pharmacy, laboratory, drug manufacturer, insurer, or medical practice. This page is educational information, not medical advice. Testosterone is a Schedule III controlled substance in the United States and requires a valid prescription. Never start, stop, or change testosterone or a diabetes medicine without your clinician. Provider prices, policies, and telemedicine rules change; each figure carries the date we checked it. For a medical emergency, call 911.
Related reading: TRT and GLP-1 · TRT and weight loss · Who should not take TRT · Low-testosterone testing · TRT and fertility · TRT providers that take insurance · Online vs local TRT · How much does TRT cost?
Sources
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- American Diabetes Association. Standards of Care in Diabetes—2026: Section 3 (Prevention or Delay of Diabetes) and Section 4 (Comprehensive Medical Evaluation and Assessment of Comorbidities). Section 3 · Section 4
- U.S. Food and Drug Administration. Testosterone Information, including 2025 cardiovascular/blood-pressure labeling changes and 2026 labeling updates. FDA
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- Gosmanov AR, et al. Increased risk of erythrocytosis in men with type 2 diabetes treated with combined SGLT-2 inhibitor and testosterone replacement therapy. PubMed
- Secondary erythrocytosis among T2DM patients with hypogonadism using SGLT-2 inhibitors and TRT. PMC
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- U.S. Drug Enforcement Administration and HHS. Fourth Temporary Extension of COVID-19 Telemedicine Flexibilities for Prescription of Controlled Medications, through December 31, 2026. DEA