"How much Tongkat Ali should I take?" has a better answer than most supplement dosing questions, because there's a decent set of human trials and most of them used the same kind of extract. The catch is the label: a milligram of standardized water extract and a milligram of raw root powder aren't the same thing, and "200:1" doesn't mean what most people assume. This guide lists every dose that's been tested in people, what each one did, and how to match a product to it. For what Tongkat Ali is and the full research picture, see our Tongkat Ali guide.
Every Dose Tested in Human Trials
| Who was studied | Daily dose and length | What happened |
|---|---|---|
| 138 women aged 40–55 with menopause symptoms | 50mg or 100mg, 12 weeks | 100mg improved menopause quality-of-life scores vs. placebo; 50mg didn't |
| 105 men aged 50–70 with low testosterone | 100mg or 200mg, 12 weeks | 200mg raised total testosterone vs. placebo from week 4; 100mg only by week 12 |
| 76 men with age-related low testosterone | 200mg, 1 month | Share with normal testosterone rose from 36% to 91% (no placebo group) |
| 45 men around 47 with androgen deficiency | 200mg, 6 months | Erectile function improved, most with exercise training plus Tongkat Ali |
| 40 young men, with or without weight training | 200mg, 8 weeks | No change in a urine testosterone marker |
| 109 men aged 30–55 | 300mg, 12 weeks | Better erectile function, libido and sperm motility scores vs. placebo |
| 25 active adults aged 57–72 | 400mg, 5 weeks | Testosterone and grip strength rose (no placebo group) |
| 13 male recreational athletes | 400mg, 6 weeks | No change in urine testosterone ratio; liver and kidney tests normal |
| 18 trained rugby players | 400mg, 7 days | No effect on hormones, performance or muscle damage |
| 32 healthy young men | 600mg, 2 weeks | Total and free testosterone rose vs. placebo |
Several of these trials, including the only dose comparison, used one patented water extract (Physta), and its manufacturer funded or co-authored them. All of them used a standardized extract, not raw root powder, so the doses below refer to an extract.
Tongkat Ali Dosage by Goal
- Low testosterone in older men: 200mg a day Established. It's the most-tested dose, and in the one trial that compared doses, 200mg worked faster and more consistently than 100mg. A 2022 meta-analysis found Tongkat Ali raised total testosterone overall, most clearly in men with low levels. Get a blood test first: low testosterone needs a medical diagnosis, and a supplement isn't a treatment for it.
- Sexual function: 200–300mg a day Mixed. 300mg for 12 weeks improved erectile-function scores in one trial, and 200mg for 6 months helped most when combined with exercise. A meta-analysis pooling two trials found no overall effect on erectile function.
- Young men and athletes: no dose clearly works Mixed. 600mg for two weeks raised testosterone in one small study, but 200mg for 8 weeks and 400mg for 6 weeks or 7 days showed no change in other trials.
- Stress and mood Preliminary. One 4-week trial of a standardized hot-water extract lowered cortisol by 16% in stressed adults. Its published summary doesn't give the dose, so there's no tested number to point to.
- Women Preliminary. One 12-week trial found 100mg a day improved menopause quality-of-life scores, without changing reproductive hormones. That's the only women's trial with a placebo group.
Matching a Label to the Studied Dose
The trial doses refer to a standardized water extract. In the EU safety review of one such extract, it contained 0.8–1.5% eurycomanone (the marker compound) and 40–65% glycosaponins. How common label types compare:
| Label says | How it compares with the trials |
|---|---|
| A named, studied extract (e.g. Physta) at 200–400mg | Closest match. Take what the label says. |
| "Standardized to 1–2% eurycomanone", 200–400mg | A reasonable match: similar marker content. |
| "200:1 extract", 400mg | Can't be compared. The ratio claims 200g of root went into 1g of extract, but it isn't a measured strength, and ratios aren't standardized between suppliers. Don't scale the dose down because of a big ratio. |
| "Tongkat Ali root 1,000mg" | Probably raw root powder, which no trial in the table used. Strength unknown. |
A common mistake is "multiplying" a ratio: assuming 100mg of a 200:1 extract equals 20g of root, and so is plenty. Nobody has tested whether ratio claims predict effects. The eurycomanone percentage is a measured number, so it's the better guide.
When to Take It
Every trial gave Tongkat Ali once a day, and none compared times of day. Most people take it in the morning. A Stanford study in mice found it increased wakefulness during the animals' active period and deepened sleep during their rest period. That fits the habit of taking it in the morning, but it's an animal study.
Two practical points:
- Keep it apart from medication. Taken at the same time as the blood pressure drug propranolol, a Tongkat Ali water extract cut how much propranolol was absorbed by 29%. Interactions with other drugs haven't been tested in people, so ask a pharmacist about timing if you take anything regularly.
- One dose, not split. No trial split the dose, so there's no evidence that splitting it helps.
Is More Better? Doses Above 400mg
There's no evidence that it is. The only trial above 400mg lasted two weeks. In the dose comparison, 200mg beat 100mg, but no one has compared 200mg with 400mg or more. Higher doses also mean more exposure to the problems below, which don't depend on whether the extract works:
- EU safety review Mixed. In 2021 the European Food Safety Authority assessed a standardized Tongkat Ali water extract proposed at up to 200mg a day. A lab test and a follow-up animal test suggested it could damage DNA, mainly in the stomach and gut lining, so EFSA concluded its safety "has not been established under any condition of use". It hasn't been shown to cause harm in people, but it means the safety question is open.
- Contamination. Two surveys of 100 products each, in Malaysia, found mercury above the legal limit in 36% and 26%. Pick a brand with third-party heavy-metal testing.
- Case reports. Doctors have published one case of liver injury (a 47-year-old man, who recovered after stopping) and one probable case of a heart-rhythm problem, atrial flutter (a 71-year-old man), after starting Tongkat Ali. Single cases don't prove cause, but they're worth knowing.
How Long to Take It
Trials ran from 1 week to 6 months, and most effects were measured at 4–12 weeks. In the 12-week dose trial, the testosterone difference from placebo was significant at week 4 and more clearly so at weeks 8 and 12, rather than fading. Nothing is known about use beyond 6 months. Many people take breaks; see should you cycle Tongkat Ali? for what the research says about that.
Who Should Avoid It
- Under-18s, and anyone pregnant or breastfeeding. No trial included them, and it affects hormones.
- Anyone with a hormone-sensitive condition, such as prostate cancer, unless their doctor agrees.
- Anyone with liver disease or a heart-rhythm problem, given the case reports.
- Anyone on regular medication, until they've checked with a pharmacist.
Stop and see a doctor if you notice yellow skin or eyes, dark urine, palpitations or a racing heart.
