Tongkat Ali
Also known as: Eurycoma longifolia, Longjack, Long Jack, Malaysian ginseng, Pasak bumi
Lower numbers = closer to natural. Higher numbers = more enhanced.
Why this rating?
A herbal root extract (Eurycoma longifolia) sold as a natural testosterone / libido / stress supplement. It is not a hormone, does not aromatize and does not suppress the HPTA, so it needs no PCT. An older systematic review found no significant effect of the supplement, and Wikipedia still states there is no clinical evidence for its effectiveness on health or any disease; a newer industry-funded RCT (Physta®, 200mg/day for 12 weeks) did find a small but statistically significant testosterone rise in men aged 50-70 with low baseline testosterone (<300ng/dL), but the change was modest (roughly 200→225ng/dL), in a hypogonadal-leaning population, and nowhere near an anabolic/muscle-building magnitude. Rated 1 as an over-the-counter herbal supplement whose performance/hormonal claims remain largely unproven for healthy lifters.
Overview
A traditional Southeast Asian herbal remedy prepared from the root of Eurycoma longifolia. Marketed to bodybuilders and men as a natural testosterone booster, libido enhancer and anti-stress ("adaptogen") supplement. Honest caveat: available clinical research has found no significant effect of the supplement, so the popular hormonal claims are weakly supported at best.
Important Warnings
- •Avoid during pregnancy and while breastfeeding: safety has not been established.
- •Rare but real case reports of liver injury exist, concentrated in bodybuilders using unlabelled high-dose products (NIH LiverTox); stick to traditional-use doses (100-400mg/day) of a standardised, third-party-tested extract.
- •Long-term safety beyond the ~12-week duration of the longest published human trials has not been established.
Purpose & Use Cases
Claimed Testosterone Support
Popularly used by bodybuilders and older men to "boost" testosterone, but clinical evidence for a meaningful effect is lacking.
Libido / Sexual Function
Traditional aphrodisiac use; studied preliminarily for erectile dysfunction, without robust confirmation.
Stress / Adaptogen
Marketed to reduce perceived stress and cortisol; evidence is preliminary and inconsistent.
Benefits
- Marketed to support testosterone and libido (weak/unproven evidence)
- Traditional aphrodisiac and general tonic use
- Non-hormonal: does not aromatize or shut down natural testosterone
- No PCT required
Good to Know
Evidence is weak and mixed, old review found nothing, a newer trial found a small effect
A 2013 systematic review found no significant effect of Eurycoma longifolia as a supplement, and Wikipedia still summarises the evidence as insufficient to confirm effectiveness for health or any disease. A newer, industry-funded RCT (Physta®, 2021) did find a small, statistically significant testosterone rise at 200mg/day in men aged 50-70 with low baseline testosterone, but the effect was modest and seen in an older, hypogonadal-leaning population, not proof of a muscle-building effect in healthy lifters. Manage expectations accordingly.
Eurycomanone is the signature compound
Extracts are often standardised to eurycomanone, a quassinoid credited with the plant’s bioactivity. Standardisation tells you what is in the capsule. It does not prove the capsule works.
Not a hormone: no PCT, but rare liver reports exist
Tongkat Ali does not aromatize or suppress natural testosterone, so no PCT is involved. The real safety flag is exceedingly rare liver injury reports (mostly in bodybuilders on high-dose products, though NIH LiverTox notes undisclosed anabolic steroid use in that population muddies the causal picture) and the unregulated nature of the supplement market. Buy tested product.
Dosage Guidelines
| Experience Level | Dosage Range |
|---|---|
| Beginner | 100 – 200 mg/day |
| Intermediate | 200 – 400 mg/day |
| Advanced | 400 – 600 mg/day |
Common standardised-extract supplement doses are 100-400mg/day, matching what NIH LiverTox describes as "traditional use." A 2021 industry-funded RCT (Physta®, Chinnappan et al.) tested 100mg and 200mg/day for 12 weeks in men aged 50-70 with low baseline testosterone (<300ng/dL): the 200mg/day group saw a small but statistically significant testosterone rise (~200→225ng/dL) from week 4 onward, while 100mg/day only reached significance at week 12. These ranges reflect real-world supplement use, NOT a validated muscle-building dose, no trial has shown a meaningful anabolic/strength effect in healthy young lifters. NIH LiverTox specifically notes that products marketed to bodybuilders are sometimes dosed far higher (1,000-1,600mg/day of raw extract), and that is where the (still rare) case reports of liver injury cluster. Doses meaningfully above the ranges here are a safety flag, not a more "advanced" protocol. Long-term safety of regular use beyond ~12 weeks has not been adequately assessed.
Side Effects
Gastrointestinal upset
uncommonNausea, abdominal discomfort or diarrhea reported with use.
Take with food; reduce dose.
Headache
uncommonMild headaches reported by some users.
Reduce dose or discontinue.
Liver injury (rare)
rareExtremely rare, isolated case reports of liver injury exist, NIH LiverTox rates the likelihood as "D: possible/rare cause", mostly in young male bodybuilders using high-dose products. LiverTox itself flags that undisclosed anabolic steroid use in that population weakens the causal link to Eurycoma longifolia specifically. The best-documented case involved hepatocellular injury with jaundice requiring hospitalisation but resolved without chronic injury; short-term clinical trials have shown no liver-enzyme abnormalities.
Use a reputable, third-party-tested product at traditional-use doses (avoid unlabelled high-dose "bodybuilding" products); stop and seek care if signs of liver problems appear (dark urine, jaundice, right-upper-quadrant pain).
General Mitigation Strategies
Generally reported as well tolerated at traditional supplement doses over trial durations of up to ~12 weeks, but long-term safety has not been adequately assessed. Rare liver injury has been reported (mostly in bodybuilders on high-dose products, with a real possibility of confounding by undisclosed anabolic steroid use). Use a third-party-tested product, avoid megadosing/unlabelled high-dose products, and avoid during pregnancy.
Post Cycle Therapy (PCT)
Not hormonal and does not suppress the HPTA. No PCT required.
How It Works
The root contains roughly 65 phytochemicals including quassinoids (the signature one being eurycomanone), plus eurycomanol, eurycomalactone, saponins, alkaloids and polyphenols. It is marketed as raising testosterone, boosting libido and lowering the stress hormone cortisol, but the pharmacology behind those claims is not established in humans, a clinical review found no significant effect of E. longifolia as a supplement. Treat the "testosterone-boosting" mechanism as a marketing hypothesis rather than confirmed physiology.
Fundamentals
Reference on the practices relevant to Tongkat Ali: how they are done and where they go wrong. Not a recommendation to use it.
WADA Status
Tongkat Ali (Eurycoma longifolia) is a herbal supplement and is not listed on the WADA Prohibited List. As with any unregulated supplement, contamination/adulteration is the practical anti-doping risk, not the herb itself.