Tongkat ali (Eurycoma longifolia)
Herbal extract studied for testosterone and stress markers. Extract ratios vary widely between products.
Supplements
Research records
Historical source snapshot. Not freshly verified, not a recommendation. Study findings, community accounts and app defaults are not interchangeable.
Publication suitability · 2026-10-15: Historical reference only; not a clinical verification. Clinical, regulatory, efficacy, safety and dose claims are not independently established by this review.
Tongkat ali (Eurycoma longifolia)
Herbal extract studied for testosterone and stress markers. Extract ratios vary widely between products.
Evidence category: Systematic review. This describes the source category, not approval or certainty.
Regulatory statement in source: Not separately recorded; do not infer approval from the evidence category.
A systematic review screened nine studies and pooled five randomised trials, finding higher serum total testosterone in men taking Eurycoma longifolia (SMD 1.352, 95% CI 0.565 to 2.138). The effect also held in the subgroup of men with hypogonadism. The authors note that more research is needed before clinical use. A separate six-month randomised trial in 45 middle-aged men combined the extract with training and reported better erectile function and testosterone, so the extract's own effect cannot be separated.
Benefits reported in the imported source
- A review pooling five randomised trials found higher serum total testosterone in men.
- The effect held in the subgroup of men with hypogonadism.
Risks and limits
- The effect did not hold in men with normal testosterone.
- The review's authors say more research is needed before clinical use.
- A trial combining the extract with training had no arm testing either alone.
Source bottom line: Pooled trials link this extract to higher total testosterone, mainly in men who were low to begin with.
Uncertainty: Reference information only. Not medical advice.
Study protocols — reports, not instructions
267 men across five randomised trials: healthy men and men with hypogonadism
- Reported regimen
- Eurycoma longifolia 100-600 mg daily, most often a water extract standardised to 0.8-1.5% eurycomanone
- Duration
- 2 weeks to 6 months
- Reported outcome
- Total testosterone rose (SMD 1.352, 95% CI 0.565 to 2.138); the effect held in the hypogonadal subgroup but not in men with normal testosterone.
- Source
- Eurycoma longifolia (Jack) Improves Serum Total Testosterone in Men: A Systematic Review and Meta-Analysis of Clinical Trials (availability check 2026-10-15: possible access barrier; not independently inspected; HTTP 200)
Claim provenance
evidence.json#/catalog:supplement:tongkat-ali/protocols/0
45 men with androgen deficiency of the aging male, mean age 47
- Reported regimen
- 200 mg Eurycoma longifolia daily and/or concurrent training 3 times a week for 60 minutes at progressive intensity, in four groups
- Duration
- 6 months
- Reported outcome
- Erectile function improved with both interventions and most in the combined group, and total testosterone rose; no arm tested the extract or training alone.
- Source
- A 6-month, double-blind, placebo-controlled, randomized trial to evaluate the effect of Eurycoma longifolia (Tongkat Ali) and concurrent training on erectile function and testosterone levels in androgen deficiency of aging males (ADAM) (Leitão et al. 2021)
Claim provenance
evidence.json#/catalog:supplement:tongkat-ali/protocols/1
Community and practice descriptions
Accounts of a practice are not evidence of safety or effectiveness. Words such as “standard”, “safe” or “recommended” describe the source account, not verified consensus or this wiki’s advice. Commercial and self-published citations are retained for traceability, not vendor endorsement or independent clinical corroboration.
Historical research outcome: no-verified-description · 2026-10-06
No suitable community description was independently verified in these checks. The entry remains empty; this does not establish that no practice exists elsewhere.
- https://www.healthline.com/nutrition/tongkat-ali-longjack-review: no-practice-description — This retrieved source was checked, but no suitable community description was independently verified. Research regimens, expert advice, product identity and efficacy claims were not repurposed.
Pharmacokinetic context
No half-life recorded in this source snapshot. No value has been inferred.
Source references
- Eurycoma longifolia (Jack) Improves Serum Total Testosterone in Men: A Systematic Review and Meta-Analysis of Clinical Trials (availability check 2026-10-15: possible access barrier; not independently inspected; HTTP 200)
- A 6-month, double-blind, placebo-controlled, randomized trial to evaluate the effect of Eurycoma longifolia (Tongkat Ali) and concurrent training on erectile function and testosterone levels in androgen deficiency of aging males (ADAM) (Leitão et al. 2021)
- PubMed: Eurycoma longifolia
Snapshot provenance
Source ID: catalog:supplement:tongkat-ali. Commit: adc7684614f9439b41d91a3312b62e7982c7e20e. Review state: historical-not-reverified. Authored links are retained separately from the canonical evidence links in the public data. App templates/defaults and rejected drafts are archived, not deployed.
Related entries and components
None listed.