Tongkat Ali Myths: Separating Hype from Evidence
Tongkat ali, or Eurycoma longifolia, has become a staple of the testosterone supplement aisle. Its marketing is loud, and the science is quieter. Our editorial team took the most common claims one by one and checked them against the clinical literature.
Myth 1: Tongkat Ali Is a Natural Steroid
Tongkat ali is a shrub from Southeast Asia, used traditionally in Malaysia and Indonesia for fever, fatigue and male sexual function. Its roots contain quassinoids such as eurycomanone, along with other bioactive compounds.
It does not contain testosterone or any anabolic steroid. Proposed mechanisms include reducing the binding of testosterone to sex hormone-binding globulin, influencing the hypothalamic-pituitary axis and lowering cortisol, but none is fully established.
Calling it a natural steroid is misleading. Any effect on hormones in clinical trials has been modest, far below what pharmacological testosterone produces.
In the United States it is sold as a dietary supplement. It is not on the WADA prohibited list, though contamination of testosterone-booster products with banned substances has been documented in the broader supplement market.
Myth 2: It Dramatically Raises Testosterone in Every Man
Trials suggest the effect depends heavily on who takes it. Tambi and colleagues studied men with late-onset hypogonadism and reported improvements in testosterone levels and symptoms with a standardized water-soluble extract.
Talbott and colleagues found that moderately stressed adults taking tongkat ali had lower cortisol and higher testosterone than those on placebo, along with improved mood scores. The changes were measurable but moderate.
In young men with normal hormone levels, there is little convincing evidence of a meaningful rise. Bodies tightly regulate testosterone, and a supplement is unlikely to push healthy levels far beyond normal.
A six-month trial in aging men by Leitão and colleagues combined tongkat ali with training and reported effects on testosterone and erectile function, but such studies are small, and results have not been consistent across the literature.
Myth 3: It Builds Muscle Like a Drug
Marketing often implies that tongkat ali accelerates muscle growth. Direct evidence is limited. Henkel and colleagues observed some improvements in strength in physically active older adults, but the study was small.
Any muscle benefit would likely come indirectly, by restoring low testosterone toward normal in men who are deficient. For healthy, well-fed lifters, training, total protein and sleep dwarf any effect a supplement might have.
Systematic reviews, including Thu and colleagues, conclude that while some trials are positive, the quality and heterogeneity of studies prevent strong conclusions about performance or body composition.
Expecting visible changes in muscle size within weeks is unrealistic. Products promising drug-like results are a red flag.
Myth 4: It Is Completely Safe Because It Is Natural
Short-term trials using standardized extracts at roughly 200 to 400 milligrams a day have generally reported few side effects. Reported complaints include insomnia, restlessness and irritability.
Long-term safety data are lacking. People with hormone-sensitive cancers, heart disease, kidney or liver disease should not use it without medical advice. Pregnant and breastfeeding women should avoid it.
Quality is a serious issue. Analyses of Southeast Asian products have, at times, detected heavy metals such as mercury and lead. In addition, some testosterone boosters have been found to contain undeclared drugs.
| Claim | What the evidence says | Verdict |
|---|---|---|
| Natural steroid | No steroid content; modest hormonal effects | Myth |
| Raises T in all men | Mainly in low-T or stressed individuals | Partly true |
| Builds muscle fast | Limited, indirect evidence | Overstated |
| Totally safe | Short-term data reassuring, long-term unknown | Unproven |
| Works for women too | Very limited data | Unclear |
Myth 5: More Is Better
Some users take several capsules a day believing higher doses produce bigger results. Clinical studies did not test very high intakes, and there is no evidence that exceeding studied doses improves outcomes.
- Choose standardized extracts with disclosed eurycomanone content
- Stay within studied ranges, commonly 200–400 mg/day
- Prefer third-party tested products
- Monitor sleep and mood; stop if adverse effects appear
- Get a medical workup if you suspect hypogonadism
Cycling, such as several weeks on and a break, is popular but untested. It is a reasonable precaution, not an evidence-based protocol.
If you have low testosterone confirmed by repeated morning blood tests, the conversation should be with a physician about causes and treatment options, not about supplement stacking.
Editorial Team Conclusions
Tongkat ali is not a steroid, and its effects on testosterone are modest and most visible in men with low levels or high stress.
Muscle-building claims are overstated, and long-term safety and product quality remain open questions.
Standardized, third-party tested extracts at studied doses are the most rational way to try it, if at all.
Readers interested in this area might also explore our articles on Fadogia agrestis, cortisol and training stress, and the basics of a male hormone panel.
References
- Tambi MI, Imran MK, Henkel RR. Standardised water-soluble extract of Eurycoma longifolia, Tongkat ali, as testosterone booster for managing men with late-onset hypogonadism? Andrologia. 2012;44 Suppl 1:226–230.
- Talbott SM, Talbott JA, George A, Pugh M. Effect of Tongkat Ali on stress hormones and psychological mood state in moderately stressed subjects. J Int Soc Sports Nutr. 2013;10(1):28.
- Henkel RR, Wang R, Bassett SH, et al. Tongkat Ali as a potential herbal supplement for physically active male and female seniors—a pilot study. Phytother Res. 2014;28(4):544–550.
- Leitão AE, Vieira MCS, Pelegrini A, et al. 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). Maturitas. 2021;145:78–85.
- Thu HE, Mohamed IN, Hussain Z, et al. Eurycoma longifolia as a potential adoptogen of male sexual health: a systematic review on clinical studies. Chin J Nat Med. 2017;15(1):71–80.
- Clemesha CG, Thaker H, Samplaski MK. 'Testosterone boosting' supplements composition and claims are not supported by the academic literature. World J Mens Health. 2020;38(1):115–122.
