Tongkat ali (Eurycoma longifolia)
Libido · Adaptogen / T-optimizer
Tier B
What this is
Huberman-driven surge in popularity. Modest but real testosterone signal in deficient men; doesn't push already-normal men supraphysiological. Better tolerated and better evidence than fadogia. Usage patterns vary — some cycle 5 on / 2 off; chronic-use safety appears fine at typical doses.
Mechanism
Malaysian 'longjack'; quassinoids (eurycomanone); proposed inhibition of SHBG and aromatase → increased free testosterone; mild antiestrogenic; adaptogenic-type stress response modulation
Dose & route
200-400 mg/day standardized extract (1-2% eurycomanone, e.g., LJ100)
Citations
- https://pubmed.ncbi.nlm.nih.gov/22429343/
- https://pubmed.ncbi.nlm.nih.gov/24142530/
- https://pmc.ncbi.nlm.nih.gov/articles/PMC7747858/
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This is an independent synthesis of published research by a non-clinician. Scores are opinions supported by citations, not prescriptions. See the full disclaimer and methodology for how this score was produced and what it does and doesn't mean.