Oxidative stress
Excess reactive oxygen species can damage sperm membranes and DNA. Antioxidant balance — from diet first, supplements when appropriate — is a major theme of male fertility research.
Lifestyle foundations
Weight
Both underweight and overweight status are associated with altered hormonal profiles and lower semen quality. Modest, sustained weight optimization often helps.
Sleep
Testosterone rises during sleep. Chronic sleep restriction (<6 hours) is associated with lower testosterone and impaired reproductive parameters.
Smoking and alcohol
Tobacco use is associated with reduced sperm count, motility, and morphology. Heavy alcohol use similarly impairs semen quality.
Nutrition
A Mediterranean-style dietary pattern — rich in vegetables, fruit, legumes, olive oil, nuts, and fish — is repeatedly associated with better semen parameters compared with Western dietary patterns.
Nutrients studied for sperm health
Presented cautiously: evidence quality varies, and individualized clinical assessment matters more than any single supplement.
- CoQ10 — studied for motility and antioxidant capacity.
- L-carnitine — studied for motility.
- Zinc — essential for spermatogenesis; deficiency correction can help.
- Selenium — antioxidant support; caution with excess.
- Vitamin D when insufficient — hormonal and general support.
- Omega-3s — associated with improved membrane composition and motility.
When to seek evaluation
Couples who have been trying to conceive for 12 months (or 6 months if the female partner is 35+) should undergo evaluation. Male-factor infertility contributes in roughly half of cases and is often correctable — do not delay seeing a specialist.