Exogenous testosterone: a preventable cause of male infertility.
Level 5 - mechanism / opinion, no new human data
Narrative literature review without systematic review methodology or new human data
PubMed 26813847 · doi:10.3978/j.issn.2223-4683.2013.06.01
What was done
A narrative literature review of PubMed articles published from 1990 to 2013 was conducted. The authors examined semen analysis, pregnancy outcomes, time to recovery of spermatogenesis, and serum and intratesticular testosterone levels associated with exogenous testosterone and protective alternative regimens.
What was found
The abstract reports no numerical values or effect sizes. It notes that exogenous testosterone suppresses intratesticular testosterone and decreases sperm production. Data from hormonal contraception studies indicate that most men recover normal sperm production within 1 year after discontinuation. Selective estrogen receptor modulators (such as clomiphene citrate) and hCG (alone or with low-dose testosterone) preserve testosterone production and spermatogenesis, while routine use of aromatase inhibitors is not recommended due to lack of long-term data.
Why it matters
This review highlights that exogenous testosterone induces reversible male infertility and outlines medical alternatives, such as SERMs or hCG, for hypogonadal men wishing to maintain fertility.
Limits
This is a narrative review with no systematic search methodology, meta-analysis, or new empirical data. The abstract provides no quantitative metrics or sample sizes, and spermatogenesis recovery rates are drawn from contraception studies rather than hypogonadal populations.