Low testosterone levels are linked to lower sperm count and reduced ability to conceive.
See the scientific wording
Testosterone deficiency is associated with reduced fertility and a significant decrease in sperm count.
Correlational — new studies may shift this
Observational2 moderate-quality studies link this claim to the outcome, but causation is not established.
What the research says
2 studies reviewedSupporting (2)
Cohort StudyHuman2026
When men took a pill that raised their testosterone, their sperm count went up too — suggesting that low testosterone is connected to having fewer sperm.
Case-Control StudyHuman2025
When men had very low testosterone, they had no sperm. But when doctors gave them hormones to boost testosterone, sperm started appearing in their semen — and the more the testicles changed in size, the more sperm they made.
Contradicting (0)
No contradicting studies found yet
That doesn't mean it's settled — it just means no study has tested the opposite.
Quality-weighted scoring: we follow the GRADE framework — each study is rated High, Moderate, Low, or Very Low based on study design, methodology rigor, and risk of bias. A single high-quality RCT can outweigh several weaker observational studies.
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Low testosterone stops the testes from making sperm because the cells that produce testosterone and support sperm development don't get the signals they need. When testosterone and another hormone called FSH are restored, these cells start working again, the sperm-making tubes in the testes get thicker, and sperm begin to appear in semen.
Score breakdown, mechanism chain, raw evidence, ideal studies needed & 2 supporting studies
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