Plant MedicineTongkat ali

Tongkat ali

Eurycoma longifolia

Family: Simaroubaceae

Also known as: Long jack, Malaysian ginseng, Pasak bumi, Ali's walking stick, Tonka ali

At a glance

Best for: Testosterone support, Male fertility, Libido, Energy, Stress
Parts used: Root
Common forms: Capsule, Extract, Tea, Powder
Evidence level: Promising
Cautions: Heavy metal contamination risk; Source and testing critical; May affect hormonal balance
Endocrine
Reproductive
Nervous
Capsule
Extract
Tea
Powder
Malaysia
Indonesia
Thailand
Philippines

What it is

Tongkat ali is a slow-growing tropical tree with a bitter root used as tonic and aphrodisiac. Key active compounds include eurycomanone and other quassinoids, which appear to work by supporting the hypothalamic-pituitary-gonadal axis to optimise testosterone production.

Traditional use

Central to traditional medicine in Malaysia, Indonesia, and the Philippines for energy, libido, and male reproductive health. Used by warrior cultures for stamina and strength. Part of traditional Malay medicine (perubatan Melayu) for hundreds of years.

What modern research suggests (Promising)

Multiple RCTs demonstrate improved testosterone levels in late-onset hypogonadism, improved semen parameters in male infertility, and reduced cortisol. Studies show improved energy, mood, and sexual function. A 2021 meta-analysis confirmed testosterone-enhancing effects. Ergogenic effects (muscle strength, athletic performance) shown in some trials.

How people use it

Standard dose: 200–400mg of standardised water-soluble extract (200:1) daily, or 1000–3000mg of root powder. Take with food. Cycling (e.g. 5 days on, 2 days off) is commonly recommended to avoid tolerance, though this is not proven necessary. Results typically noticed after 3–6 weeks.

Safety + interactions

The main safety concern is heavy metal contamination from poor-quality sources—buy only from reputable brands with third-party testing. Well-tolerated in clinical trials when using quality extracts. Avoid if you have hormone-sensitive conditions (prostate cancer). Limited safety data in women and in pregnancy—avoid.

May interact with: Hormone therapy, Diabetes medications

Name clarity note

The trade name 'tongkat ali' is used almost exclusively for Eurycoma longifolia but products sold under this name may contain other species or adulterants. Due to high demand and price, adulteration is common. The name 'tonka ali' is a marketing variant of the same plant, not a different species. Genuine Malaysian government-approved exports ('Malaysian Tongkat Ali') provide some quality assurance.

Quality notes

Heavy metal contamination (particularly mercury and lead) is a significant concern—Malaysian soil often contains elevated heavy metals and Eurycoma roots absorb them. Always buy from brands with published third-party heavy metal testing. Standardised water-soluble root extract (2% eurycomanone) is the most studied form (LJ100, PhytoGold). Malaysian government-certified products preferred.

Community Insights

Premium members share their experiences and knowledge about this plant.

Disclaimer: This content is educational and not medical advice. Always consult a qualified healthcare provider before using any herbs or supplements, especially if you are pregnant, nursing, taking medications, or have a medical condition.

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