Synopsis

Source of validity: Scientific
Rating (out of 5): 2

Bulbine natalensis is a South African plant traditionally used for various medicinal purposes, but its use as an athletic and exercise aid is primarily supported by recent, preliminary scientific studies rather than long-standing tradition. Limited animal and small-scale human research has suggested that extracts of Bulbine natalensis may influence testosterone levels, which could theoretically support muscle growth, physical performance, or recovery. For example, a few rodent studies have reported increased serum testosterone and luteinizing hormone levels following administration of Bulbine natalensis extracts. Some early human studies, such as a small pilot clinical trial, have indicated modest increases in free testosterone in men, but these studies are limited by small sample sizes, short durations, and lack of rigorous controls. There is also some concern about potential adverse effects on liver and kidney function at higher doses, as seen in animal models. Overall, while scientific interest exists and some preliminary data suggest possible benefits for athletic performance due to hormonal modulation, the evidence is not robust or conclusive. Larger, high-quality human studies are needed to confirm efficacy and safety. Thus, the evidence rating is 2 out of 5, reflecting weak but present scientific support for its use as an athletic and exercise aid.

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