A man begins Ozempic. After losing thirty pounds, he notices that his sex drive has returned. A few months later, bloodwork reveals increased testosterone levels. Did the injection cause his hormones to “boost”?<\/p>\n
Possibly–but not in the same way as testosterone therapy.<\/p>\n
Ozempic and Mounjaro are not fertility drugs. They do not contain testosterone.<\/p>\n
Any reproductive benefit is likely to be indirect and related to improvements in metabolic syndrome, rather than a direct impact on the testicles.<\/p>\n
Having substantial excess weight can interfere with hormonal signals that are involved in testosterone production. Fat tissue can also convert testosterone to estrogen. Combine that with insulin resistance, poor sleep, or sleep apnea and testosterone levels can plummet. This is sometimes referred to as obesity-related functional hypogonadism. The testicles might still be able to respond to hormonal signals; it’s the surrounding “metabolic” issues that are suppressing testosterone production.<\/p>\n
Improving overall metabolic health can allow testosterone to rise. As insulin resistance is improved and abdominal fat is reduced, sex drive, erections, and other signs of testosterone production can also improve–but there are many possible causes for a decrease in libido, unrelated to testosterone levels.<\/p>\n
The evidence is suggestive, but not definitive.<\/p>\n
A 2026 systematic review looked at ten studies and 639 men. The use of GLP-1 medications was associated with increased total testosterone levels in men with obesity, type II diabetes, or obesity-related functional hypogonadism. Levels of free testosterone were more variable.<\/p>\n
There have been small studies that have looked at semen quality. In a 24-week study that looked at men with obesity, type II diabetes, and functional hypogonadism, participants were given either semaglutide or testosterone therapy. Semaglutide users had improvements in weight, total testosterone, and sperm morphology (the shape of the sperm).<\/p>\n
That’s a promising sign, but it was a small study. Improvements in sperm morphology do not necessarily translate to an ability to conceive; the researchers also did not find that Ozempic or Mounjaro reliably increased odds of pregnancy or live birth. The Endocrine Society’s 2026 review states that GLP-1 medications do not appear to negatively impact male reproductive hormones, and could be an option for men with obesity-related hypogonadism, but larger clinical studies are needed.<\/p>\n
There’s even less information about tirzepatide, the active ingredient in Mounjaro, and its effects on human fertility.<\/p>\n
Since tirzepatide can promote substantial weight loss, it could indirectly improve testosterone levels in men whose low hormone levels are related to obesity or insulin resistance.<\/p>\n
That’s not a fertility boost, per se, but it is a testosterone boost. Animal studies have not seen impaired sperm production, mating behaviors, or fertility in male rats given tirzepatide. Animal studies are a good start, but they can’t predict exactly what long-term use of the drug might do to human sperm production.<\/p>\n
GLP-1 drugs and testosterone therapy are fundamentally different<\/p>\n
That’s an important consideration for men who are considering using Ozempic or Mounjaro to increase fertility.<\/p>\n
External testosterone can help improve sex drive and other symptoms of low testosterone, but it has the unintended side effect of shutting off the testicles’ production of hormones. Some men experience severely reduced sperm counts or stop producing sperm entirely while on testosterone replacement therapy. Ozempic and Mounjaro do not appear to have this effect. Men with obesity-related functional low testosterone might find that it’s more effective and safer to treat their underlying metabolic condition, rather than using testosterone therapy. Other options for increasing testosterone might be considered before undergoing hormone therapy.<\/p>\n
Men should not rely on Ozempic or Mounjaro to treat male infertility, based on current evidence.<\/p>\n
Ozempic and Mounjaro are approved to treat type II diabetes. Wegovy and Zepbound, brand-name versions of semaglutide, are approved to treat chronic weight gain or obesity in adults who meet specific criteria. None of these drugs are approved to treat low testosterone or male infertility. A man who loses weight on one of these drugs may see an improvement in testosterone and sexual function. His semen quality may also improve, particularly if he has obesity-related hypogonadism–but an infertile couple still needs more than that. Couples who are having trouble conceiving should talk to their doctor about undergoing a fertility workup and semen analysis, as well as morning testosterone levels and LH\/FSH testing, rather than relying upon assumptions about the causes of infertility based on a man’s body weight.<\/p>\n
Ozempic and Mounjaro can create the right conditions for fertility, but calling them male fertility drugs may be jumping to conclusions.<\/p>\n","protected":false},"excerpt":{"rendered":"
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