Metabolic & Cardiometabolic
anabolic-androgenic steroids causes testicular atrophy and impaired fertility
In plain terms: Do anabolic steroids cause testicular shrinkage and reduced fertility?
Part of: 💊 anabolic-androgenic steroids
Yes — steroids suppress the body's own testosterone and sperm production, shrinking the testes and often causing infertility; it usually recovers over months after stopping but sometimes incompletely.
Evidence ladder
How far up the ladder this claim has climbed. A high consensus on a low rung means "consistent so far," not "proven in people."
Top evidence so far: Population patterns (Observational)
How the studies fall
The evidence (9)
| Source | Grade | Stance | Quality | Finding |
|---|---|---|---|---|
| Vorona 2018 · Minerva Endocrinol | observational | supports | moderate | Review states AAS cause reversible suppression of spermatogenesis up to azoospermia via HPG-axis negative feedback. |
| Hashimi 2025 · Asian J Androl | observational | supports | high | Review documents exogenous testosterone/AAS as a well-established cause of HPG-axis suppression, impaired spermatogenesis and azoospermia. |
| Sukegawa 2020 · Acta Urol Jpn | observational | supports | low | Exogenous testosterone suppressed gonadotropins producing azoospermia to severe oligospermia, with variable recovery time after cessation. |
| Christou 2017 · Sports Med | observational | supports | high | Systematic review and meta-analysis found AAS use markedly suppresses gonadotropins and spermatogenesis, reducing sperm concentration and testicular volume. |
| Kumar 2025 · Basic Clin Androl | observational | supports | moderate | Testosterone/AAS abuse suppresses intratesticular testosterone causing impaired spermatogenesis, testicular atrophy and azoospermia, with prolonged or incomplete recovery. |
| Kanayama 2015 · Addiction | observational | supports | moderate | Long-term AAS misusers frequently showed prolonged hypogonadism after discontinuation, an under-recognized reproductive consequence. |
| Rasmussen 2016 · PLoS One | observational | supports | moderate | Current and former AAS abusers exhibited suppressed testosterone and hypogonadal symptoms, including reduced testicular function, persisting years after cessation. |
| Solanki 2023 · Endocr Connect | observational | supports | moderate | Scoping review found testicular atrophy and suppressed spermatogenesis are expected after AAS abuse, recovering over months to years but sometimes incompletely. |
| Oduwole 2014 · FASEB J | animal | supports | moderate | Exogenous testosterone doses that suppressed gonadotropins consistently blocked spermatogenesis in a knockout mouse model, supporting the fertility-suppression mechanism. |
Disagree, or know a study we missed?
We grade by evidence, not opinions. The way to weigh in is to point us to a study we haven't cited (check the evidence table above first), or to flag a problem with one we have. Every submission is reviewed; if it holds up, the grade updates and shows in Science Changes Its Mind.
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Educational only, not medical advice. Grades and scores reflect published evidence weighted by study design and quality; see the methodology.