Lowered Male Fertility

Xu etal (2003) identified a significantly positive correlation between selenium levels and sperm density, sperm number, sperm motility and sperm viability in human volunteers. Supplementation with selenium in selenium-replete subfertile men has been shown to improve sperm motility and the chance of successful conception in over half of treated patients (Scott et al 1998). When taken with vitamin E over

6 months, selenium produces a statistically significant increase in sperm motility, per cent live and per cent normal spermatozoa, with effects reversing after supplement cessation (Vezina et al 1996). Although results are encouraging, particularly for subfertile men with low selenium status, one negative intervention trial was located that found that supplementation had no effect (Iwanier & Zachara 1995).

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