Tongkat Ali
South-east Asian root with clinical evidence for testosterone and libido in men.
What is Tongkat Ali?
Tongkat ali is a tall shrub native to Malaysia, Indonesia, and Thailand. The root contains active compounds called eurycomanone and quassinoids that are thought to stimulate the release of luteinising hormone (LH) from the pituitary, which in turn signals the testes to produce more testosterone. Standardised extracts (typically 100:1 or Physta) are used in clinical trials.
What does the evidence say?
A 2012 randomised, double-blind, placebo-controlled trial by Tambi et al. in the Journal of the International Society of Sports Nutrition found 200mg of standardised tongkat ali extract daily for four weeks restored testosterone levels to normal in 90.8% of men with late-onset hypogonadism, compared to 35.5% on placebo. A 2014 study by Henkel et al. found significant improvements in sexual function and sperm quality. Most studies use the Physta extract at 200–400mg/day.
Good evidence from several studies, but with some limitations in size, duration, or methodology.
Dosage guide
| Effective dose | 200–400mg of standardised 100:1 extract per day |
| Maximum dose | 400mg/day (higher doses not well studied) |
| Timing | Morning, ideally with food. |
Best form to buy
Physta standardised extract (produced by Biotropics Malaysia) is the most clinically studied form. Products listing only "tongkat ali root powder" without standardisation are likely underdosed.
Who benefits most
Men with suboptimal testosterone, reduced libido, or fertility concerns. Most relevant for men in the 35 to 60 age range. Not a replacement for TRT in clinically low testosterone.
Side effects and safety
Generally well tolerated at recommended doses. Can increase body temperature and restlessness at high doses. Some reports of sleep disruption if taken in the evening.
“One of the more credible natural testosterone support compounds. The LH-stimulating mechanism is legitimate. Buy Physta extract specifically, a lot of cheap tongkat ali is adulterated or underdosed.”