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the claim

Higher testosterone levels are associated with higher male fertility.

the verdict
CONTESTED PARTIAL
Recorded sources
2 sources for · 4 against

Counts group repeated records of the same source within each side. They do not measure evidence strength or source independence.

Is it true that higher testosterone levels are associated with higher male fertility?

Partly. Evidence is mixed and only partial: one source notes that among already-fertile men semen quality showed no relationship with testosterone, and another reports that testosterone replacement raises serum testosterone while suppressing spermatogenesis, while a smoking study suggests lower testosterone may reduce fertility. No retrieved item directly measures the association between higher testosterone levels and higher male fertility in the general male population.

Verdict: CONTESTED PARTIAL · 2 sources for, 4 against · Last checked

The private library was unavailable for some searches in this check. Missing library results are not evidence against the claim.

Evidence for · 2
Testosterone
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Testosterone. (n.d.). en.wikipedia.org. https://en.wikipedia.org/wiki/Testosterone

Evidence against · 4
Current smoking is associated with lower seminal vesicles and ejaculate volume, despite higher testosterone levels, in male subjects of infertile couples.
2015
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Lotti, F., Corona, G., Vitale, P., Maseroli, E., Rossi, M., Fino, M. G., & Maggi, M. (2015). Current smoking is associated with lower seminal vesicles and ejaculate volume, despite higher testosterone levels, in male subjects of infertile couples.. doi.org. https://doi.org/10.1093/humrep/deu347

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More for · 1
The Effect of Smoking on Fertility Hormones in Male Adult Smokers in South-South Nigeria
2015
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The Effect of Smoking on Fertility Hormones in Male Adult Smokers in South-South Nigeria. (2015). hal.science. https://hal.science/hal-05500179v1

More against · 3
Testosterone Levels Are Negatively Associated with Childlessness in Males, but Positively Related to Offspring Count in Fathers | PLOS One
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Testosterone Levels Are Negatively Associated with Childlessness in Males, but Positively Related to Offspring Count in Fathers | PLOS One. (n.d.). journals.plos.org. https://journals.plos.org/plosone/article?id=10.1371/journal.pone.0060018

Clomiphene citrate versus testosterone replacement therapy in male hypogonadism: a systematic review of literature and meta-analysis.
2026
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BT, C., BC, B., L, G., BN, S., CMO, M., MMG, P., B, U., RS, M., RAS, d. S., R, F., & JA, S. d. C. (2026). Clomiphene citrate versus testosterone replacement therapy in male hypogonadism: a systematic review of literature and meta-analysis.. doi.org. https://doi.org/10.1007/s00228-026-04134-3

Evidence-Based Prescription Strategies for Clomiphene Citrate in Male Hypogonadism and Fertility Management
2025
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Evidence-Based Prescription Strategies for Clomiphene Citrate in Male Hypogonadism and Fertility Management. (2025). hal.science. https://doi.org/10.9734/ajrimps/2025/v14i1289

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