Evidence supporting the use of: Brazil nut
For the body system: Male Reproductive System

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Synopsis

Source of validity: Scientific
Rating (out of 5): 3

Brazil nuts are notably rich in selenium, a trace mineral essential for male reproductive health. Scientific research indicates that selenium plays a critical role in spermatogenesis (the production of sperm) and testosterone synthesis. Several studies have found that selenium supplementation can improve sperm motility, morphology, and overall semen quality, particularly in men with low selenium status or infertility issues. For example, a randomized controlled trial published in the "Journal of Urology" (2009) reported that selenium, in combination with vitamin E, significantly improved sperm motility among infertile men. Additionally, selenium acts as an antioxidant, protecting sperm cells from oxidative stress, which is known to impair fertility. However, it is important to note that while moderate selenium intake appears beneficial, excessive intake can have toxic effects. Most of the research focuses on selenium as a nutrient rather than specifically Brazil nuts, but as Brazil nuts are one of the richest natural sources of selenium, their consumption is often recommended for supporting male reproductive health. In summary, there is moderate scientific evidence supporting the use of Brazil nuts, via their selenium content, for male reproductive system health, but more direct studies on Brazil nut supplementation specifically are warranted.

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