Tongkat ali, also called longjack, is a Southeast Asian root studied in more than 15 human trials for testosterone, libido, and stress. Standardized extracts deliver eurycomanone, the plant's main active compound, at daily doses of 200 to 400 mg in most studies.
This guide covers what tongkat ali is, how it works, its evidence-based benefits, dosing, safety, and who should avoid it.
Quick Answer
Tongkat ali is a root extract used to support healthy testosterone, libido, mood, and exercise performance in men. Most clinical studies use 200 to 400 mg of a standardized extract daily for 4 to 12 weeks. It is not a drug and should not replace medical care for low testosterone or sexual problems.
Key Takeaways
- Tongkat ali is studied in over 15 human clinical trials.
- Standardized extracts deliver eurycomanone at 200 to 400 mg daily.
- Most testosterone benefits appear after 2 to 4 weeks of use.
- Tongkat ali may lower cortisol by about 16 percent in stress.
- Avoid tongkat ali with hormone-sensitive conditions or before age 18.
Related Products
What Is Tongkat Ali (Longjack)?
Tongkat ali is the root of Eurycoma longifolia, a slender tree native to Malaysia, Indonesia, and Thailand. Traditional healers have used it for 2 main reasons: as a men's tonic for energy and drive, and as a general remedy for fatigue. Modern supplements concentrate the root into standardized extracts.
The root's key compounds are quassinoids, especially eurycomanone, along with polysaccharides and glycoproteins. Extract labels often show a ratio such as 200:1 or a set percentage of eurycomanone.[1]Eurycoma longifolia: traditional uses, chemistry and pharmacology — Molecules (2016) View source
- Common names: tongkat ali, longjack, Malaysian ginseng, pasak bumi
- Plant part used: the root, not the leaf or bark
- Key actives: eurycomanone and related quassinoids
- Typical form: capsules of standardized root extract
How Tongkat Ali Works in the Body
Tongkat ali works mainly by influencing how the body handles existing hormones rather than by adding hormones directly. Research suggests it may free up bound testosterone and support a healthier stress-hormone balance. These are indirect effects, and they build over 2 to 4 weeks.
The most discussed mechanism involves sex hormone-binding globulin (SHBG). When testosterone is bound to SHBG it is inactive, so releasing it can raise free testosterone without new hormone production.
- Frees bound testosterone from SHBG, raising the active free fraction
- Supports cortisol balance, which protects testosterone during stress
- Acts as an adaptogen, helping the body cope with physical load
Key Benefits of Tongkat Ali
Tongkat ali has 4 benefit areas with human evidence: testosterone support, libido, stress and mood, and exercise performance. The effects are real but modest, and they matter most for men who are older, stressed, or have below-average hormone levels. For the full evidence review, see what the research shows on tongkat ali.
| Benefit Area | What Studies Suggest |
|---|---|
| Testosterone | Higher free and total testosterone in men with low levels |
| Libido | Improved sexual well-being scores at 300 mg over 12 weeks |
| Stress and mood | Lower cortisol and less tension in stressed adults |
| Performance | Better strength markers in older and active users |
Tongkat Ali and Testosterone
Testosterone support is the most-studied use of tongkat ali. In one trial, 200 mg of a standardized water-soluble extract taken daily for 1 month improved Aging Males' Symptoms scores and raised serum testosterone in men with late-onset low testosterone.[2]Tongkat ali as testosterone booster in late-onset hypogonadism — Andrologia (2012) View source
A 2022 meta-analysis of 9 clinical trials also concluded that Eurycoma longifolia improves serum total testosterone in men.[3]Eurycoma longifolia improves serum total testosterone: meta-analysis — Medicina (2022) View source The learn-more path here is our guide to tongkat ali for testosterone and training.
- Effects are largest in men with low or borderline testosterone
- Young men with normal levels often see smaller changes
- Free testosterone tends to respond faster than total
Tongkat Ali for Libido and Vitality
Libido is the second core use. A 12-week randomized trial in 109 men aged 30 to 55 found that 300 mg of a freeze-dried water extract improved sexual well-being and quality-of-life scores versus placebo.[4]RCT of PHYSTA extract for quality of life and sexual well-being — Evid Based Complement Alternat Med (2012) View source
Tongkat ali is not an erection drug and does not work like a PDE5 inhibitor. It supports drive gradually rather than producing an on-demand effect.
- Not on-demand: benefits build over weeks, not minutes
- Drive over mechanics: most effect is on desire and energy
- Better with basics: sleep and fitness amplify results
Tongkat Ali, Stress and Energy
Tongkat ali behaves like an adaptogen for stress. In a 4-week study of 63 moderately stressed adults, a standardized extract lowered tension by 11 percent and improved the salivary cortisol-to-testosterone profile compared with placebo.[5]Tongkat Ali on stress hormones and mood — J Int Soc Sports Nutr (2013) View source
Because chronic stress and high cortisol suppress testosterone, calming that pathway is one plausible way the root supports energy and drive.
- Cortisol dropped by roughly 16 percent in stressed users
- Mood measures like tension and anger improved modestly
- Effects apply to both men and women under stress
How to Take Tongkat Ali
Most studies use 200 to 400 mg of a standardized extract once daily, often in the morning with food. Benefits build with consistency over 2 to 12 weeks, so daily use matters more than a large single dose. A clean daily option is Remedy's Longjack (Tongkat Ali) 1000 mg in vegan capsules.
| Goal | Typical Daily Dose |
|---|---|
| General vitality | 200 mg standardized extract |
| Testosterone support | 200 to 400 mg |
| Training and stress | 300 to 400 mg |
For a full breakdown of timing and cycling, our practical dosing notes explain the details.
Safety, Interactions and Who Should Avoid It
Tongkat ali is generally well tolerated at studied doses, and a 2020 toxicity study found no harmful effects at typical intakes.[6]Eurycoma longifolia-infused coffee oral toxicity study — Nutrients (2020) View source Still, some people should avoid it, and it can interact with medications that affect hormones or blood pressure.
| Group or Drug Class | What to Do |
|---|---|
| Hormone-sensitive conditions | Avoid without physician guidance |
| Blood pressure or diabetes meds | Ask a doctor before combining |
| Under 18, pregnant or nursing | Do not use |
Limitations of the Evidence
Most tongkat ali trials are small, short, and often funded by extract makers, so results should be read with care. A 2024 systematic review of testosterone-boosting supplements found the overall evidence base is thin and inconsistently regulated.[7]Do testosterone boosters really increase serum testosterone? — Int J Impot Res (2024) View source
- Sample sizes are usually under 120 participants
- Extract standardization varies widely between brands
- Long-term data beyond 6 months is limited
These gaps do not erase the benefits, but they explain why tongkat ali is best seen as a supportive tool rather than a cure. Pairing it with sleep, training, and other supplements for men gives the most reliable results.
Frequently Asked Questions
What is tongkat ali used for? +
Tongkat ali is used mainly to support healthy testosterone, libido, stress balance, and exercise performance in men. Most benefits are studied at 200 to 400 mg of standardized extract daily. Effects are modest and build over 2 to 4 weeks, so it works best as a daily supportive supplement rather than a quick fix.
Does tongkat ali really increase testosterone? +
In men with low or borderline testosterone, yes, modestly. A meta-analysis of 9 trials found higher serum testosterone with Eurycoma longifolia. Young men with normal levels usually see smaller changes. The likely mechanism is freeing testosterone bound to SHBG, not producing new hormone, so results build gradually over several weeks.
How long does tongkat ali take to work? +
Most people notice changes in energy and mood within 2 to 4 weeks of daily use. Hormone and libido effects in studies typically appear at 4 to 12 weeks. Daily consistency matters more than dose size. Missing several days a week can extend the timeline, since the benefits depend on steady blood levels.
Is tongkat ali like Viagra? +
No. Viagra is a prescription PDE5 inhibitor that produces an erection on demand within about 1 hour. Tongkat ali is a supplement that supports libido and testosterone gradually over weeks. It does not directly cause erections. If you have erectile dysfunction, see a doctor, because it can signal treatable heart or hormone issues.
What is the best time to take tongkat ali? +
Morning with food is the most common approach, since tongkat ali may be mildly stimulating for some users. Taking 200 to 400 mg once daily keeps blood levels steady. If it feels activating, avoid late-day doses so it does not disturb sleep. Consistency at the same time each day gives the best results.
Is ashwagandha or tongkat ali better? +
They serve different goals. Ashwagandha is stronger for stress, anxiety, and sleep, with about 30 percent cortisol reductions in trials. Tongkat ali is more targeted at testosterone and libido. Many men stack a low dose of each. If your main issue is stress, start with ashwagandha; if it is drive and hormones, start with tongkat ali.
Can women take tongkat ali? +
Some women use tongkat ali for stress, energy, and libido, and a few studies included women. Doses tend to be lower, around 100 to 200 mg daily. It is not suitable during pregnancy or breastfeeding, or with hormone-sensitive conditions. Women should talk to a clinician first, especially if taking hormonal or thyroid medication.
Is it safe to take tongkat ali every day? +
For most healthy adults, daily use at 200 to 400 mg appears well tolerated in studies up to 6 months. A toxicity study found no harmful effects at typical doses. Some users cycle 5 days on and 2 off, though cycling is not clinically required. Avoid it with hormone-sensitive conditions or interacting medications.
What are the downsides of tongkat ali? +
The main downsides are mild: restlessness, irritability, or trouble sleeping if taken late, reported by a small share of users. Quality varies widely between brands, and some cheap products are underdosed or contaminated. Evidence is still limited, with most trials under 120 people, so keep expectations realistic and choose a standardized extract.
Who should not take tongkat ali? +
Avoid tongkat ali if you are under 18, pregnant, or breastfeeding, or if you have a hormone-sensitive condition such as prostate or breast cancer. People on blood pressure, diabetes, or hormone medications should ask a doctor first. It is a supplement, not a treatment for diagnosed low testosterone or erectile dysfunction.
Related Reading
Related Products
