Rankings / Hormones & Endocrine
Tongkat ali (Eurycoma longifolia)
Hormones & Endocrine · Adaptogen / T-optimizer
Tier B
Bottom line
Read Off Label grades Tongkat ali (Eurycoma longifolia) as B (6.8/10) based on moderate evidence, low-med benefit magnitude, and a low-risk safety profile.
Huberman-driven surge in popularity.
Studied, labeled, or reported-use context: 200-400 mg/day standardized extract (1-2% eurycomanone, e. — OTC; not individualized guidance.
If you were testing this on yourself
Two properties decide whether an n-of-1 experiment is readable and recoverable. These describe the experiment — they are not a judgment about whether to run it, and nothing here is a recommendation.
Can you undo it?
Reverses on stopping
Reversible at standardised extract doses.
Can you tell if it worked?
Readable — 4–12 weeks
A total and free testosterone panel; subjective libido and energy.
What would fool you Testosterone varies by time of day by 20–30% — test at the same morning hour both times or the comparison is meaningless. It also moves with sleep, body fat, and acute illness. Extract standardisation varies widely across products.
What the evidence says
Huberman-driven surge in popularity. Modest but real testosterone signal in deficient men; doesn't push already-normal men supraphysiological. Compared with fadogia, this row has human trial data and a higher Safety score; direct head-to-head evidence is absent. Usage patterns vary — some cycle 5 on / 2 off; long-term safety data at commonly reported doses remain limited.
Mechanism
Malaysian 'longjack'; quassinoids (eurycomanone); proposed inhibition of SHBG and aromatase → increased free testosterone; mild antiestrogenic; adaptogenic-type stress response modulation
Studied, labeled, or reported dose & route
200-400 mg/day standardized extract (1-2% eurycomanone, e.g., LJ100)
This records doses and routes described in studies, approved labeling, clinical practice, or documented use. It is not individualized guidance and does not establish safety; context changes with indication, formulation, health history, monitoring, and other medicines.
Citations
A link means the source informed this entry; it does not mean every claim on the page comes from that source. If a citation looks wrong or you want a claim re-checked, send a correction.
Common questions
- What does the evidence show about Tongkat ali (Eurycoma longifolia)'s effects?
- Read Off Label rates the evidence for Tongkat ali (Eurycoma longifolia) as Moderate and the benefit magnitude as low-med, producing an overall grade of B (6.8/10). Huberman-driven surge in popularity.
- What safety findings are reported for Tongkat ali (Eurycoma longifolia)?
- Tongkat ali (Eurycoma longifolia) has a low risk profile in the database. Low (generally well-tolerated; historical heavy-metal contamination varies by source and third-party testing) Legal status: OTC.
- What doses or routes are reported for Tongkat ali (Eurycoma longifolia)?
- 200-400 mg/day standardized extract (1-2% eurycomanone, e.g., LJ100) This is context from studies, approved labeling, clinical practice, or documented use; it is not individualized guidance and does not establish safety.
- How does Tongkat ali (Eurycoma longifolia) work?
- Malaysian 'longjack'; quassinoids (eurycomanone); proposed inhibition of SHBG and aromatase → increased free testosterone; mild antiestrogenic; adaptogenic-type stress response modulation
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.