Tongkat Ali

Medically reviewed by Prof. Giorgi Pkhakadze, MD, MPH, PhD — GMJ Editorial Board

What is Tongkat Ali?

Tongkat Ali (Eurycoma longifolia) is a flowering shrub native to Southeast Asia, particularly Malaysia, Indonesia, Thailand, and Vietnam. Also known as Malaysian ginseng, longjack, or pasak bumi, this traditional medicinal plant has been used for centuries in folk medicine. The root of Tongkat Ali is the primary source of bioactive compounds and is typically processed into standardized extracts for supplementation. Modern research has focused on its potential effects on testosterone levels, energy, and overall vitality, making it increasingly popular in the Western supplement market.

Health benefits & uses

Testosterone support (moderate evidence): Several clinical trials suggest Tongkat Ali may help support healthy testosterone levels, particularly in men with low-normal levels. A randomized controlled trial found that daily supplementation improved testosterone levels and reduced cortisol in stressed adults.

Exercise performance and body composition (limited evidence): Some studies indicate potential benefits for muscle strength, lean body mass, and physical performance, though results are mixed and more research is needed.

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Stress and mood support (limited evidence): Preliminary research suggests Tongkat Ali may help reduce stress hormones and improve mood parameters, possibly through its effects on the hypothalamic-pituitary-adrenal axis.

Sexual health (limited evidence): Traditional use and some small studies suggest potential benefits for libido and sexual function, though high-quality clinical evidence remains limited.

How it works

Tongkat Ali contains several bioactive compounds, including eurycomanone, eurycomanol, and various alkaloids and saponins. These compounds are thought to work through multiple mechanisms. Research suggests the extract may influence the hypothalamic-pituitary-gonadal axis, potentially supporting the body’s natural testosterone production rather than providing exogenous hormones. The compounds may also affect cortisol levels and stress response pathways. Additionally, some components appear to have antioxidant properties that could contribute to overall cellular health. The exact mechanisms are still being studied, and effects likely result from the combined action of multiple bioactive compounds rather than a single active ingredient.

Dosage

There is no established RDA (Recommended Daily Allowance) or UL (Upper Limit) for Tongkat Ali as it is not considered an essential nutrient. Typical adult dosages in clinical studies range from 200-600 mg daily of standardized root extract, usually taken in divided doses with meals. Most commercial supplements provide 200-400 mg daily. The concentration and standardization of active compounds can vary significantly between products, making dosage comparison difficult. Some products are standardized to specific percentages of eurycomanone or total glycosaponins. It’s important to consult with a healthcare provider before starting supplementation, especially for individuals with underlying health conditions or those taking medications.

Food sources

Tongkat Ali is not available as a conventional food source. The root is traditionally prepared as a bitter tea or decoction in Southeast Asian countries, but this is primarily medicinal rather than nutritional use. In its native regions, the root may be boiled with other herbs to create traditional remedies. For practical supplementation purposes, standardized extracts in capsule or powder form are the most reliable and convenient sources of the bioactive compounds. Fresh or dried root preparations are rarely available outside of Southeast Asia and would be difficult to dose consistently.

Safety & side effects

Tongkat Ali appears to be generally well-tolerated in healthy adults when used at recommended dosages for short to moderate periods. Reported side effects are typically mild and may include restlessness, insomnia, or mild gastrointestinal upset. Some users report increased energy levels that may interfere with sleep if taken late in the day. Long-term safety data is limited, as most studies have been relatively short-term. There are theoretical concerns about potential effects on hormone-sensitive conditions, though clinical evidence is lacking. Quality and purity can vary between manufacturers, making it important to choose reputable brands that provide third-party testing results.

Interactions

Limited research exists on specific drug interactions with Tongkat Ali. However, due to its potential effects on hormone levels, it may theoretically interact with hormone replacement therapy, testosterone medications, or treatments for hormone-sensitive conditions. There may also be potential interactions with diabetes medications, as some research suggests possible effects on blood sugar levels. Individuals taking blood pressure medications should use caution, as traditional use suggests potential cardiovascular effects. The herb may also interact with other supplements that affect hormone levels, such as DHEA or tribulus terrestris, potentially amplifying effects. Always consult healthcare providers about potential interactions before combining Tongkat Ali with prescription medications or other supplements.

Who should be cautious

Pregnant and breastfeeding women should avoid Tongkat Ali due to lack of safety data and potential hormonal effects. Individuals with hormone-sensitive conditions, including certain cancers (breast, prostate, ovarian), endometriosis, or uterine fibroids, should exercise caution due to potential hormonal influences. People with diabetes should monitor blood glucose levels closely, as the supplement may affect blood sugar. Those with cardiovascular conditions should consult their healthcare provider before use. Children and adolescents should avoid Tongkat Ali unless specifically recommended by a healthcare provider. Individuals scheduled for surgery should discontinue use at least two weeks prior due to potential effects on blood sugar and blood pressure during surgical procedures.

Frequently asked questions

How long does it take to see effects from Tongkat Ali?

Most studies suggest that noticeable effects may begin within 2-4 weeks of consistent daily use, with optimal benefits potentially taking 8-12 weeks. Individual responses can vary significantly based on baseline hormone levels, overall health, and dosage used.

Can women take Tongkat Ali?

While most research has focused on men, some studies have included women. However, women should be particularly cautious due to potential hormonal effects and should consult with healthcare providers before use, especially if they have hormone-sensitive conditions.

Is Tongkat Ali the same as ginseng?

No, despite being called “Malaysian ginseng,” Tongkat Ali is botanically unrelated to true ginseng species (Panax). They are different plants with different active compounds and mechanisms of action.

Should Tongkat Ali be cycled?

Some practitioners recommend cycling (taking breaks) when using Tongkat Ali long-term, though there’s no established protocol. A common approach is 5 days on, 2 days off, or several weeks on followed by a break, but this should be discussed with a healthcare provider.

Can Tongkat Ali be taken with other testosterone-supporting supplements?

Combining with other hormone-affecting supplements may amplify effects and should be done cautiously under professional guidance. It’s important to avoid excessive stimulation of hormonal pathways and monitor for side effects when combining supplements.