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Higher Testosterone

What the evidence says raises or protects testosterone naturally, sleep, strength training, vitamin D, losing excess weight, and, just as usefully, what it says does not.

86Studies

86Human studies

2026Most recent

14Countries

Effects of cigarette smoking on semen quality, reproductive hormone levels, metabolic profile, zinc and sperm DNA fragmentation in men: results from a population-based study.

Frontiers in endocrinology2023n = 1,222 (450 smokers, 772 non-smokers)

Cross SectionalHuman

This study set out to examine how cigarette smoking affects semen quality, hormone levels, metabolic health, zinc levels, and sperm DNA damage in young Russian men. It compared 450 smokers…

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