WHO double-blind infertility trial
Did not establish a clear fertility benefit.
Older infertility population.
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Anabolic-androgenic steroid
mesterolone
Proviron is used more for libido and a reported harder look than for building much new muscle. It is an oral DHT-derived androgen. It is not an aromatase inhibitor and does not reliably fix estrogen or fertility problems. Main downsides include hair and prostate concerns and prolonged erections.
Bayer's Proviron product information separates maintenance for hypogonadism from initial treatment and infertility schedules. The medical regimen does not validate nonmedical physique use or guarantee fertility.
Randomized infertility studies did not show consistent meaningful benefit. Evidence for physique claims is weak.
Androgenic hair/skin effects, possible sexual/mood effects, adverse lipids and fertility/endocrine disruption.
HDL/LDL/triglycerides; liver markers; reproductive hormones/fertility; androgenic adverse effects.
Used medically in some countries; not FDA-approved in the United States and not approved for bodybuilding.
Did not establish a clear fertility benefit.
Older infertility population.
Original source ↗Evaluated semen/fertility outcomes.
Older evidence; inconsistent findings.
Original source ↗No significant benefit was shown in the comparison.
Limited size and older methods.
Original source ↗