Does Ozempic Affect Testosterone? What the Research Shows

TL;DR — Key Takeaways

• Ozempic (semaglutide) likely raises testosterone, indirectly, through weight loss.
• In one 18-month study of men with obesity/type 2 diabetes on GLP-1 drugs, the share with normal testosterone rose from 53% to 77%.
• It works via fat loss, better insulin sensitivity, and less inflammation, not by directly stimulating testosterone.
• GLP-1 drugs don’t suppress the male hormone axis; they may also improve sperm quality.
• The benefit is mainly for overweight/obese men whose low T is driven by weight.

Ozempic (semaglutide) likely raises testosterone, indirectly, via weight loss. In an 18-month study of men with obesity or type 2 diabetes on GLP-1 drugs, the share with normal testosterone rose from 53% to 77% as they lost weight. Since excess fat lowers testosterone, losing it restores it. Ozempic doesn’t directly stimulate testosterone, the fat loss does.

With GLP-1 drugs everywhere, men are asking whether Ozempic helps or hurts their T. The emerging answer is encouraging. Here’s the research. (Part of our guide on what lowers testosterone; for the overview, our complete TRT guide.)

Does Ozempic Affect Testosterone?

Yes likely in a good way, indirectly. Ozempic (semaglutide) is a GLP-1 receptor agonist for type 2 diabetes and weight loss. Because excess body fat is the #1 driver of low testosterone, the significant weight loss these drugs cause can restore testosterone, especially in overweight and obese men. This is the flip side of the fat-and-testosterone cycle we cover in what lowers testosterone.

Key fact: In one 18-month study, GLP-1 drugs like Ozempic raised the share of obese men with normal testosterone from 53% to 77%, driven by weight loss, not the drug directly.

What the Research Shows

The emerging evidence is positive:

• A study of 110 men with obesity or type 2 diabetes on GLP-1 drugs (semaglutide/tirzepatide) found that with ~10% weight loss, the proportion with normal testosterone rose from 53% to 77% over 18 months.
• Men on GLP-1 therapy saw increases in both total and free testosterone.
• Researchers concluded GLP-1s do not suppress the male HPG (hormone) axis and may improve reproductive hormones and semen parameters in obese men, mainly through weight loss.

How Ozempic Raises Testosterone (Indirectly)

It’s the weight loss and metabolic improvement, not a direct hormonal push:

• Less body fat: Less testosterone converted to estrogen (fat contains aromatase).
• Better insulin sensitivity: Less of the insulin resistance that suppresses testosterone (the same mechanism behind sugar lowering testosterone).
• Reduced inflammation: Healthier hormone signaling.

This is exactly why fat loss is the top natural lever in how to increase testosterone naturally, Ozempic is just a powerful tool for achieving it.

Does Ozempic Lower Testosterone?

No, the evidence points the opposite way. Some men worry GLP-1 drugs might suppress hormones, but research suggests they don’t acutely suppress the male hormone axis. For overweight men, the net effect on testosterone is positive because of the weight loss. (One caveat: rapid, extreme weight loss with very low calorie intake could theoretically stress hormones, but that’s about crash dieting, not the drug itself.)

Does Ozempic Help Male Fertility?

Possibly. Because it improves weight, insulin sensitivity, and inflammation, GLP-1 therapy may improve semen parameters in obese men relevant to TRT and fertility. This is still emerging research, but the direction is encouraging for overweight men trying to conceive.

Can Ozempic Replace TRT?

Not exactly, they do different things. Ozempic treats weight/diabetes and indirectly raises testosterone if your low T is weight-driven. TRT directly restores testosterone. For an overweight man with weight-related low T, losing fat (with or without a GLP-1 drug) may raise testosterone enough to avoid TRT. But if testosterone stays low after weight loss, that’s when to consider whether TRT is right for you and its benefits. Some men even use them together under medical guidance.

Conclusion

Does Ozempic affect testosterone? Yes and likely for the better. GLP-1 drugs like semaglutide don’t directly stimulate testosterone, but by driving significant weight loss and improving insulin sensitivity, they can restore testosterone in overweight men one study saw the share with normal testosterone jump from 53% to 77% over 18 months. They don’t suppress the male hormone axis and may even help fertility. If your low testosterone is weight-driven, losing fat is powerful medicine.

For the full picture on causes and fixes, see what lowers testosterone and how to increase testosterone naturally and explore everything on men’s testosterone health at TRT NYC.

👉 Losing weight and curious about your levels? Check your testosterone with an at-home test kit before and after, and discuss options with a licensed provider.

Frequently Asked Questions

Does Ozempic affect testosterone?

Yes, likely positively and indirectly. Because excess body fat lowers testosterone, the weight loss Ozempic (semaglutide) causes can restore it in overweight men. Studies show GLP-1 drugs raise testosterone via weight loss rather than by directly stimulating hormone production.

Does Ozempic increase testosterone?

It can, indirectly. In an 18-month study of men with obesity or diabetes, GLP-1 drugs raised the share with normal testosterone from 53% to 77% alongside about 10% weight loss. The increase comes from fat loss and better metabolic health, not a direct hormonal effect.

How do GLP-1 drugs raise testosterone?

Through weight loss and metabolic improvement: less body fat means less testosterone converted to estrogen, better insulin sensitivity reduces hormone suppression, and lower inflammation supports healthier hormone signaling. GLP-1 drugs don’t directly stimulate testosterone production.

Does Ozempic help male fertility?

Possibly. Research suggests GLP-1 therapy may improve semen parameters in obese men, largely through weight loss and better metabolic health. It’s still emerging evidence, but the direction is encouraging for overweight men concerned about fertility.

Does Ozempic lower testosterone?

The evidence points the opposite way, GLP-1 drugs don’t appear to suppress the male hormone axis, and for overweight men the net effect on testosterone is positive due to weight loss. Extreme crash dieting could theoretically stress hormones, but that’s about under-eating, not the drug.

Can Ozempic replace TRT?

Not directly. Ozempic treats weight and diabetes and can indirectly raise testosterone if your low T is weight-driven, while TRT directly restores testosterone. For weight-related low T, fat loss may raise testosterone enough to avoid TRT; if it stays low, discuss TRT with your doctor.

Written by: TRT NYC Editorial Team: Last updated: July 2026 · Reviewed against: peer-reviewed research and Endocrine Society presentations (see References).

Medical disclaimer: This article is for educational purposes only and is not medical advice. Don’t start or stop any prescribed medication without your doctor. trtnyc.com is an independent informational resource, not a medical provider.