Fadogia Agrestis: Benefits, Dosage, Forms & Research

What the Research Says

The evidence base for Fadogia agrestis is extremely limited. Yakubu et al. (2005) published the primary study, administering aqueous stem extract to male Wistar rats at 18, 50, and 100 mg/kg body weight for 5 days. The extract produced dose-dependent increases in serum testosterone and pro-sexual behavioral changes. However, the same research group published a follow-up study (Yakubu et al., 2008) showing significant dose-dependent testicular toxicity, including damage to seminiferous tubules and interstitial tissue at 100 mg/kg. These findings raise serious safety concerns that remain unresolved due to the complete absence of human clinical trials. The supplement gained popularity through social media and podcast discussions (notably Huberman Lab) rather than through clinical evidence, and the gap between consumer enthusiasm and scientific evidence is among the largest in the supplement industry.

Benefits of Fadogia Agrestis

• Testosterone increase — Yakubu et al. (2005) found that aqueous stem extract of Fadogia agrestis significantly increased serum testosterone levels in male rats in a dose-dependent manner at 18, 50, and 100 mg/kg body weight over 5 days
• Aphrodisiac effects — the same study by Yakubu et al. showed increased mount frequency, intromission frequency, and ejaculatory latency in rats, suggesting pro-sexual effects mediated by testosterone increases
• Leydig cell stimulation — the proposed mechanism involves direct stimulation of testicular Leydig cells via saponin compounds, potentially increasing endogenous testosterone production rather than providing exogenous hormones

Side Effects and Safety

Safety profile: Caution Needed

Potential Side Effects

• SIGNIFICANT CONCERN: testicular histological changes (damage to seminiferous tubules) observed in rats at 100 mg/kg — long-term safety in humans is completely unknown
• Elevated liver and kidney function markers observed in animal studies at higher doses
• No human safety data exists — all side effect information is extrapolated from rat studies
• Anecdotal reports from users include elevated heart rate, insomnia, and mood changes

Drug & Supplement Interactions

• Testosterone replacement therapy — potential additive effects; avoid combining without medical supervision
• Fertility medications — unknown interaction potential due to lack of human data
• Hepatotoxic medications — animal data suggests potential liver effects; use caution with other hepatotoxic substances