Synopsis

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

Tongkat ali (Eurycoma longifolia) is a traditional Southeast Asian herbal remedy widely used for enhancing male fertility, libido, and overall reproductive health. Recent scientific research has begun to validate some of these traditional uses. Several clinical studies and meta-analyses indicate that tongkat ali supplementation may improve several parameters of male reproductive health, including sperm motility, sperm concentration, and semen volume, particularly in subfertile men. Some randomized controlled trials have shown increases in serum testosterone levels in men who used tongkat ali extracts, potentially mediating improvements in sexual function and libido.

Animal studies have also demonstrated increased testicular function and improved spermatogenesis after tongkat ali administration. The proposed mechanisms include modulation of the hypothalamic-pituitary-gonadal axis and reduction of cortisol, leading to improved testosterone synthesis. While the majority of studies focus on male reproductive benefits, evidence for effects in women is limited and less conclusive.

Nevertheless, the overall quality of evidence is moderate (rated 3/5), as most studies have small sample sizes, short durations, and varying extract standardizations. Larger, longer-term randomized controlled trials are needed to further confirm efficacy and safety. In summary, tongkat ali is supported both by tradition and a growing—though not yet robust—body of scientific evidence for supporting male reproductive system health.

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