Ozempic and male fertility: what a small semaglutide semen study can tell you
A randomized study in men with obesity, type 2 diabetes and functional hypogonadism measured semen features. It did not measure whether couples achieved pregnancy or live birth.
Ozempic is not FDA approved to improve male fertility. A small trial of semaglutide in men with obesity, type 2 diabetes and functional hypogonadism reported an improvement in sperm morphology, a measure of sperm shape. It did not show that semaglutide improves the chance of conception or live birth. Those are different outcomes from the semen measures in the study.123
Read the groups before reading the headline
The open-label study randomized 25 men: 13 to semaglutide and 12 to testosterone undecanoate. The participants had a defined combination of conditions; they were not a general sample of men seeking to conceive. The comparator was an active testosterone treatment, not placebo or untreated weight management. A comparison involving testosterone also raises its own fertility question, since exogenous testosterone can suppress sperm production. Treomark’s testosterone and fertility guide covers that separate decision.13
In the reported analysis, median normal morphology changed from 2% to 4% in the semaglutide group and from 2% to 1% in the testosterone group. The change in sperm concentration in the semaglutide group was not statistically significant. The small sample and open-label design limit what a reader can conclude. The morphology result does not show that every semen measure improved or establish a medication effect for men outside the study population.1
Make sure the evidence measures your actual goal
| Question | What would help answer it |
|---|---|
| Sperm shape | A clinical semen analysis that reports morphology, with the observation period. |
| Count or movement | Concentration and motility results, read separately from shape. |
| Pregnancy or birth | Pregnancy or live-birth follow-up, which this trial did not measure. |
| Other care goal | The clinician's indication for the exact drug and a plan to address fertility separately. |
Read a lab change in the context of a couple’s question
Semen morphology reports the share of assessed sperm that meet a laboratory definition of normal shape. It is one part of a semen evaluation. The male infertility guideline explains that semen measures alone are not a diagnosis of fertility or infertility. In a trial with no pregnancy follow-up, an apparent improvement in morphology cannot establish how often pregnancy occurred, whether it occurred sooner, or whether the outcome differed between groups. It also cannot answer fertility questions for someone who does not have the combination of metabolic and hormone findings studied here.13
Name the comparison you wish the study had made
If the decision is whether to start a diabetes medicine while planning for children, ask the prescriber why that medicine is being considered and how fertility concerns will be evaluated. If the decision is between different treatments for low testosterone, the study’s active comparator matters, but it is still too small to settle that choice. If someone offers semaglutide as a fertility treatment, ask for a study that measured pregnancy or live birth and for the exact indication claimed. These are three decisions with different evidence requirements.123
If you already have a semen report, bring it along with your list of prescriptions and the reason each was proposed. A clinician can interpret individual semen results in the context of a fertility assessment. A weight management consultation can identify the medical reason for the proposed prescription and coordinate with a clinician evaluating fertility. Ask who owns each decision so that a weight goal is not mistaken for a fertility plan.123
Sources
- Diabetes, Obesity and Metabolism / original randomized study. Semaglutide improved sperm morphology in obese men with type 2 diabetes mellitus and functional hypogonadism. Full small open-label randomized trial with an active testosterone comparator and semen outcomes. Accessed .
- DailyMed / Ozempic prescribing information. OZEMPIC (semaglutide) injection prescribing information. Identifies the exact injection's labeled uses, which do not include treating male infertility. Accessed .
- American Urological Association / American Society for Reproductive Medicine. Diagnosis and Treatment of Infertility in Men. Explains the role and limitations of semen findings as part of a fertility evaluation. Accessed .