Tongkat Ali
A traditional herb with modern evidence for testosterone and stress
Quick Answer
Tongkat Ali (Eurycoma longifolia) is a Southeast Asian herb with clinical evidence for increasing testosterone and reducing cortisol. A meta-analysis of RCTs found significant testosterone improvements in both healthy men and those with low T. One study showed 16% cortisol reduction with mood improvements. Typical dose: 200-400mg daily of standardized extract. A 6-month trial found testosterone increased in ~50% of men with androgen deficiency. Generally safe, but product quality varies, choose reputable, third-party tested brands.
Medium Evidence
Good studies, but more research needed
Safety: Generally safe at recommended doses. Quality and contamination concerns with some products.
What Is This?
Tongkat Ali (Eurycoma longifolia, also called "Longjack" or "Malaysian Ginseng") is a flowering plant native to Southeast Asia. The root has been used traditionally for centuries as an energy tonic and aphrodisiac. Modern research has validated some of these traditional uses.
Active compounds:
- Eurypeptides: Bioactive polypeptides (36 amino acids) that appear to enhance testosterone production
- Eurycomanone: A quassinoid compound with various biological effects
- Glycosaponins and other compounds: Contribute to overall activity
Standardized extracts: Quality products use standardized hot-water extracts, typically standardized to 22% eurypeptides or specific eurycomanone content. Standardization ensures consistent potency and safety.
How It Works
Tongkat Ali appears to increase testosterone through several mechanisms:
Primary Mechanism, HPG Axis Stimulation: At the hypothalamus-pituitary level, tongkat ali stimulates greater LH (luteinizing hormone) release, which signals the testes to produce more testosterone. This is different from exogenous testosterone, which suppresses natural production.
Enzyme Enhancement: The eurypeptides activate CYP17 enzyme, enhancing the conversion of pregnenolone and progesterone to DHEA and androstenedione, precursors to testosterone.
Cortisol Reduction: A clinical trial found 16% reduction in cortisol exposure. Since cortisol and testosterone have an inverse relationship, reducing cortisol may support testosterone levels.
Clinical Evidence:
Meta-Analysis (2022): Systematic review of 9 studies found significant improvement in total testosterone after tongkat ali treatment in both healthy volunteers and men with low testosterone.
6-Month RCT: Double-blind, placebo-controlled trial in men with androgen deficiency found:
- ~50% of participants had increased testosterone
- Improved erectile function when combined with exercise
- Well-tolerated with no significant adverse effects
- 16% reduction in cortisol
- Improved testosterone status
- Reduced tension (-11%), anger (-12%), confusion (-15%)
How to Start
Choose a quality, standardized extract
This is critical. Quality varies enormously, and some products have been found contaminated with mercury. Choose brands that use standardized hot-water extracts and have third-party testing.
Tips:
- •Look for "standardized to 22% eurypeptides" or similar
- •Choose products with third-party testing (NSF, USP, or independent lab)
- •Avoid suspiciously cheap products
- •Malaysian-sourced products are traditional, but quality matters more than origin
Start with standard dose
Begin with 200mg daily of standardized extract. This is the dose used in many clinical trials and is well-tolerated. Take in the morning, ideally with food.
Tips:
- •200mg is a good starting point
- •Take with breakfast for convenience
- •Some prefer cycling (5 days on, 2 days off)
Assess and adjust
After 2-4 weeks, assess how you feel. You may increase to 400mg daily if well-tolerated and seeking stronger effects. Doses up to 600mg have been used in studies.
Tips:
- •Some people do well at 200mg, others prefer 400mg
- •Effects may take 4-8 weeks to fully manifest
- •Consider baseline and follow-up testosterone testing
Consider cycling
Many users cycle tongkat ali (e.g., 5 days on/2 days off, or 8 weeks on/2 weeks off) to prevent tolerance, though this isn't definitively required by research.
Tips:
- •Cycling is common practice but not proven necessary
- •Some use continuously without issues
- •If effects seem to diminish, try a brief break
What to Expect
Initial effects
Some people notice increased energy or improved mood within the first week. Libido changes may begin. Others notice nothing initially, this is normal.
Building effects
Stress reduction and mood improvements typically become noticeable. The cortisol study measured benefits at 4 weeks. Energy and libido effects may strengthen.
Testosterone effects
Testosterone changes take longer to manifest. By 4-8 weeks, those who respond should notice improvements. Consider testing testosterone levels to objectively assess.
Full effects
The longest clinical trial was 6 months. Continued use maintains effects. If you haven't noticed benefits by 2-3 months, tongkat ali may not be effective for you.
Dosing Information
Recommended Dose
200-400mg daily
Range
100-600mg daily
- •Most clinical trials use 200-400mg daily
- •Start at 200mg, increase if needed and tolerated
- •Use standardized extracts (22% eurypeptides or specified eurycomanone)
- •Minimum effective dose appears to be ~50mg standardized extract
Quality varies significantly. A 2006 study found 26% of tongkat ali products had mercury levels above recommended limits. Choose third-party tested products from reputable brands.
Practical Details
Timing
Take in the morning, preferably with food. Some users experience increased energy, so evening dosing may interfere with sleep. Can be taken daily or cycled (5 on/2 off or similar).
Duration
Clinical trials have run up to 6 months. Many users take it continuously or cycle periodically. Long-term safety data beyond 6 months is limited.
Cost
$25-50/month
Quality standardized extracts cost more. Very cheap products may indicate poor quality or contamination risk. Invest in reputable brands with testing.
Risks & Considerations
Potential Risks
- •Product quality and contamination concerns (mercury found in some products)
- •Limited long-term safety data
- •May interact with blood pressure medications
- •High doses (2000mg/kg in animal studies) showed potential DNA damage
Possible Side Effects
- •Generally well-tolerated
- •Occasional: mild GI symptoms, restlessness
- •Rare: itching
- •Insomnia if taken too late in the day
Who Should Avoid This
- •Pregnancy and breastfeeding
- •Hormone-sensitive cancers (breast, prostate)
- •Use of blood pressure medications (especially propranolol)
- •Children
- •Diabetes, heart disease, kidney or liver disease (use caution)
Key Research
Meta-analysis of tongkat ali on testosterone
Complementary Therapies in Medicine, 2022
Systematic review and meta-analysis of 9 studies found significant improvement in total testosterone levels after E. longifolia treatment in both healthy volunteers and men with low testosterone.
View Study6-month RCT in men with androgen deficiency
Maturitas, 2021
Double-blind, placebo-controlled trial in 45 men with ADAM. Tongkat ali (200mg) combined with exercise improved erectile function and increased testosterone in ~50% of participants over 6 months.
View StudyTongkat ali for stress and cortisol
Journal of the International Society of Sports Nutrition, 2013
4-week supplementation in 63 moderately stressed adults reduced cortisol by 16%, improved testosterone status, and reduced tension (-11%), anger (-12%), and confusion (-15%).
View StudyFrequently Asked Questions
Does tongkat ali actually increase testosterone?
Yes, with caveats. A 2022 meta-analysis of clinical trials found significant testosterone improvements. However, effects vary, a 6-month trial found ~50% of men with androgen deficiency responded. It's not as powerful as TRT but works through different mechanisms (stimulating natural production rather than replacing it).
How is tongkat ali different from other "testosterone boosters"?
Unlike most supplements marketed as testosterone boosters (which often have minimal evidence), tongkat ali has multiple randomized controlled trials and a meta-analysis supporting its effects. It appears to work by stimulating the HPG axis and enhancing testosterone-producing enzymes.
Is tongkat ali safe?
At recommended doses (200-400mg), it appears safe in clinical trials up to 6 months. However, product quality is a major concern, 26% of products tested had elevated mercury. Choose third-party tested products. Avoid if pregnant, breastfeeding, or have hormone-sensitive cancers.
Should I cycle tongkat ali?
Many users cycle (5 days on/2 off, or 8 weeks on/2 weeks off) to prevent tolerance. However, this isn't definitively required by research, clinical trials used continuous dosing. If you notice diminishing effects, a brief break may help.
Can women take tongkat ali?
Yes. The stress/cortisol study included both men and women with positive results. Women saw reduced cortisol and improved mood. However, most testosterone-focused research is in men. Women should use lower doses and monitor for any hormonal effects.
What dose should I take?
Start with 200mg daily of standardized extract. This is well-supported by research. You can increase to 400mg if well-tolerated. Ensure you're using a standardized product (22% eurypeptides or specified eurycomanone content) from a reputable brand.
Sources
- Examine: Tongkat Ali Research(review)
- Healthline: Tongkat Ali Review(expert)
- LiverTox: Tongkat Ali Safety(expert)
Related Interventions
Disclaimer: This information is for educational purposes only and is not medical advice. Always consult with a qualified healthcare provider before starting any new health practice or supplement. Evidence levels and recommendations can change, this content was last updated December 2025.