Selenium for Reproductive Health
Selenium is essential for sperm formation and correcting deficiency improves motility, but supplementation in replete men has not improved fertility outcomes.
Overview
Verdict
How It Works
Dosing & Protocol
Typical dose
- Recommended dose
- 100-200 mcg/day of selenium with food; benefit is largely confined to correcting deficiency
- Expected timeframe
- 3 months
Protocol
- form
- Selenomethionine or selenium-enriched yeast; sodium selenite in some fertility trials
- duration
- 3 months, matching the spermatogenesis cycle for male fertility endpoints
- co factor
- Take with food. Evidence is mixed and varies by endpoint. Selenium is required for spermatogenesis - selenoprotein GPx4 forms the structural capsule of the sperm mitochondrial midpiece - and trials in subfertile men, often combining selenium with NAC or other antioxidants, report improved sperm concentration and motility. Evidence in women is weaker: selenium is involved in thyroid function and reduces thyroid peroxidase antibodies in autoimmune thyroiditis, which matters in pregnancy, and low selenium has been associated with miscarriage and pre-eclampsia in observational data, but intervention trials are limited and inconsistent.
- titration
- Up to 200 mcg/day under medical supervision; 400 mcg/day is the tolerable upper limit from all sources
- starting dose
- 55-100 mcg/day with food
Evidence
What the studies say
Antioxidants for male subfertility
de Ligny W, et al
Subfertile couples should be advised that overall, the current evidence is inconclusive based on serious risk of bias.
Influence of oral vitamin and mineral supplementation on male infertility: a meta-analysis and systematic review
Buhling K, Schumacher A, Eulenburg CZ +1 more
significant improvement in semen parameters for selenium (200µg/day and 100µg/day) (standard mean difference [SMD] 0.64 for oligozoospermia, 1.39 for asthenozoospermia)
The Impact of Minerals on Female Fertility: A Systematic Review
Kapper C, Stelzl P, Oppelt P +1 more
The analysis revealed that minerals like selenium, zinc, and copp
Safety
Caveats
Fertility problems warrant proper assessment rather than sequential supplement trials: a couple not conceiving after 12 months, or 6 months if the woman is over 35, should be investigated - semen analysis, ovulation assessment, tubal patency and hormone testing identify treatable causes, and delay reduces success rates. Safety of selenium is the pressing issue: the SELECT trial found increased type 2 diabetes risk at 200 mcg/day, chronic excess causes selenosis with hair loss, brittle nails, garlic breath, rash and peripheral neuropathy, and acute overdose can be fatal. The tolerable upper intake level is 400 mcg/day from all sources and Brazil nuts contain up to 90 mcg each. In pregnancy the RDA rises only to 60 mcg/day and the upper limit still applies - high-dose selenium in pregnancy is not advised, and excess selenium has been associated with adverse outcomes. Women trying to conceive should take 400 mcg/day of folic acid, which has strong evidence for preventing neural tube defects, and should confirm adequate vitamin D and iodine.
Less likely to help if
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