Discover the truth about Ozempic and testosterone. Learn if it lowers levels, how weight loss affects hormones, and treatment options at Spartan Medical Group.
Ozempic (semaglutide) is a GLP-1 agonist medication widely used for weight loss and improving blood sugar in people with obesity or type 2 diabetes. It works by enhancing insulin sensitivity, suppressing appetite, and helping users lose fat over time.
For many men, losing weight is great, but there are also concerns about how a medication that changes metabolism might affect hormone balance. Testosterone is crucial for muscle mass, libido, mood, energy, and sexual function. Understanding Ozempic and testosterone and how they affect their levels is especially important for men over 25 and anyone focused on strength or appearance.
Whether you’re using Ozempic or considering it, or if you want to understand how to protect your testosterone level while losing weight, this article covers: how Ozempic works, what current research shows about its impact on testosterone and sexual health, whether it might lower testosterone directly, and strategies to minimize risks.
How Ozempic Works and Its Metabolic Effects
Ozempic (semaglutide) acts on the GLP-1 receptor and helps with weight loss by reducing appetite, slowing gastric emptying, lowering blood sugar, and improving insulin sensitivity. Over time, these changes lead to a reduction in fat, especially visceral fat, which is metabolically active and can adversely affect hormones.
Typically, metabolic markers improve over several weeks to months. Weight loss often begins earlier, with measurable improvements in glucose control, insulin resistance, and a reduction in fat mass. Ozempic’s effects on metabolism tend to reach more stable outcomes by 12-18 months in clinical settings, including improved cardiovascular risk markers and sometimes hormone markers.
What Current Research Shows About Ozempic and Testosterone
Several recent studies, including findings presented at ENDO 2025, indicate that in men with obesity or type 2 diabetes, GLP-1 medications like semaglutide are associated with improved testosterone levels. In one study of ~110 men, the fraction with normal testosterone levels rose significantly over an 18-month period.
At the same time, some research is less detailed. There are reports that weight loss alone sometimes yields variable hormonal responses. Not every individual sees a strong rise in testosterone. Also, muscle loss during rapid weight loss, low protein intake, or other factors (like increased sex hormone-binding globulin or SHBG) can complicate things.
Notably, the ENDO 2025 data (README: Portillo Canales et al.) found that among men with obesity or type 2 diabetes treated with GLP-1 drugs, total and free testosterone improved in many participants, suggesting normalization is possible.
Does Ozempic Lower Testosterone Directly?
So far, there is no strong evidence that Ozempic directly suppresses testosterone production in healthy men. Most changes in testosterone seen in studies are likely secondary, due to fat loss, improved insulin sensitivity, reduced aromatase activity (less conversion of testosterone to estrogen), and lower inflammation.
However, some confounding factors may mimic lowered testosterone or reduce hormone levels temporarily: rapid weight loss, inadequate protein or muscle loss, nutritional deficits, or low-calorie diets. Also, as visceral fat decreases, SHBG may change, which can influence free testosterone (the biologically active form) without necessarily hurting total testosterone.
There are a few documented cases showing testosterone levels dropping after starting semaglutide, but data is limited and often intertwined with changes in body composition and diet.
How to Minimize Any Negative Effects on Testosterone
- Ensure adequate protein intake and strength training during weight loss to preserve lean mass.
- Monitor testosterone level test (both total and free) before, during, and after starting semaglutide.
- Maintain healthy sleep and manage stress, as both impact testosterone production.
- Avoid overly restrictive caloric deficits; slow, sustainable weight loss is often better for hormone health.
- Discuss with your medical provider whether testosterone replacement therapy might be appropriate if symptoms persist.
For more informational content, please read our blog:
- How Low Testosterone Impacts Muscle Mass and Strength
- Does Low Testosterone Affect Mood?
- Testosterone Gel vs Injection: Which TRT Option Is Right for You?
- Will Testosterone Help with Erectile Dysfunction?
- How to Test Testosterone Levels: An Effective Guide
How Spartan Medical Group Can Help
At Spartan Medical Group, we understand that balancing weight loss medications like Ozempic with hormone health is critical. If you’re using Ozempic, considering it, or experiencing signs of low testosterone (like low libido, fatigue, loss of muscle strength, or erectile dysfunction), we can help.
Our services include:
- Hormone evaluation (total and free testosterone level)
- Assessment of body composition and muscle mass
- Personalized care plan that may include lifestyle, diet, supplementation, or testosterone replacement therapy if needed
- Ongoing monitoring to ensure hormone levels are restored, symptoms improve, and treatment is safe
If you’re concerned that Ozempic may be affecting your testosterone, don’t wait. Book a consultation with Spartan Medical Group today. Let us help you protect your strength, your sexual health, and your hormonal vitality so you can achieve your goals safely.