Tongkat Ali
Eurycoma longifolia root extract. Proposed mechanism: inhibits SHBG binding and reduces cortisol, indirectly increasing free testosterone. Some evidence for phosphodiesterase inhibition (PDE4/5) contributing to libido effects.
This compound sits in research-grey territory. The caveats below carry more weight than for FDA-approved entries — read them.
More human trial data than Fadogia — at least 3 small RCTs in late-stage hypogonadal or athletic populations show modest free testosterone increases (20–40%) and improved stress markers. Effect appears most pronounced in populations with elevated cortisol (late-stage athletes, sleep-deprived). Standardization is critical — Physta® extract (100:1 water extract) is the form used in most positive RCTs; many consumer products use inferior extract ratios.
Extract quality varies massively — clinical studies use Physta® (MIT-licensed). Monitor labs if running long-term. Estrogenic effects reported at high doses in some case reports. Stack with cortisol-reduction (sleep hygiene, adaptogens) to maximize SHBG effect.
External links to PubMed searches, ClinicalTrials.gov, and FDA materials. We do not host papers — we point at canonical sources.
Dietary supplement under DSHEA. Not FDA-evaluated for testosterone claims. Malaysia: approved traditional medicine. No WADA prohibited status.
Distilled themes from named communities — Reddit threads, forums, creator commentary. Not direct quotes; not clinical evidence. Useful for calibrating expectations against what real self-experimenters report.
Generally better-regarded than Fadogia in terms of human evidence. Stacked with Fadogia by many users seeking synergy — no interaction data supports this but no red flags either.