Tongkat ali, the root of Eurycoma longifolia, is a long-used Southeast Asian botanical that has become a mainstream men’s-health ingredient abroad. Brands ask about it expecting the answer to be complicated in Japan, the way it is for several herbal ingredients. For tongkat ali the classification question has a clear answer; the more useful discussion is what the evidence actually shows.
This guide covers Japan’s status for the root, what randomised trials and a meta-analysis report for testosterone and related outcomes, and how to formulate a compliant product.
Health supplements are foods, not medicines, and are not a substitute for medical treatment. Nothing here is a claim that any product prevents, treats or cures a disease.
💬 Planning a tongkat ali product made in Japan? We check the full formula against Japanese food law first. See Japan-made supplement OEM.
Tongkat ali’s status in Japan
The root of Eurycoma longifolia is listed on Japan’s register of substances not judged to be pharmaceutical, provided no medicinal claims are made, so a Japanese factory can manufacture it as a food.
Japan’s food-drug classification system (食薬区分) maintains two relevant lists: substances treated exclusively as medicines, and substances not judged to be pharmaceutical as long as no medicinal effect is claimed for them. Following a March 2019 revision, the root of Eurycoma longifolia (トンカットアリ, sometimes referenced by an older Japanese name for the plant) is listed on the non-pharmaceutical side. Commercial capsule and extract products describing themselves as food supplements are sold in Japan today, consistent with that classification.
In practice, this means:
- A Japanese GMP factory can manufacture a tongkat ali tablet, capsule or powder as a food, provided the labelling makes no medicinal claims, in the same way as most botanical ingredients on the non-pharmaceutical list.
- The classification covers the root itself. An extract’s specific processing and standardisation still needs its own supplier documentation, and any companion ingredient in a combination formula needs its own separate check.
💬 Building a men’s-vitality range and want the full formula checked against Japanese food law before you commit? Tell us your concept.
What the research shows
Randomised, placebo-controlled trials and a 2022 meta-analysis report increases in serum testosterone with Eurycoma longifolia root extract, most consistently in men with low baseline testosterone.
| Study | Design/What was analysed | Reported result |
|---|---|---|
| Randomised, double-blind, placebo-controlled multicentre trial, Food & Nutrition Research 2021, 65 (PMID 34262417) | 105 men aged 50–70 with age-related low testosterone; standardised aqueous root extract at 100 mg or 200 mg daily versus placebo, 12 weeks | The 200 mg group showed increased total testosterone from week 4, reduced fatigue-scale scores and improved quality-of-life scores compared with placebo; the 100 mg group showed a testosterone increase by week 12 |
| Systematic review and meta-analysis, Medicina 2022, 58(8) (PMID 36013514) | 9 studies identified, 5 randomised trials pooled in the meta-analysis, healthy and hypogonadal men | A significant increase in total testosterone with Eurycoma longifolia supplementation (SMD 1.35, 95% CI 0.57–2.14); authors described it as a promising option particularly in men with clinically low testosterone (hypogonadism), while calling for more research before clinical use |
Caveats worth keeping in view:
- Several trials, including the 2021 study above, used industry-funded, standardised extracts rather than generic root powder; results may not generalise to every extraction method or concentration.
- The meta-analysis pooled only 5 trials, and included studies in men with a diagnosed low-testosterone condition alongside healthy volunteers; the authors themselves called for more research before treating the finding as settled.
- These trials measured testosterone, fatigue and quality-of-life scores, not sexual function outcomes, and the results should not be read as evidence for a specific sexual-health claim.
Checked against the published abstracts on 25 September 2026.
Wording that stays on safe ground
Describe tongkat ali by what has been measured, in the population studied, without extending into sexual-health or hormone-disorder claims.
| Safer wording | Wording to avoid |
|---|---|
| ”Studied for testosterone levels and vitality in ageing men” | Any sexual-function or performance claim |
| ”Contains a standardised root extract” with the amount per serving | ”Boosts low T” or naming hypogonadism as something the product addresses |
| ”Studied at 100–200 mg of standardised extract daily” | Doses or claims not matched to the extract standardisation actually studied |
How tongkat ali is formulated
Tongkat ali is typically supplied as a standardised root extract rather than raw powder, so extract ratio and standardisation are the main specification decisions.
| Dosage form | Why brands choose it | What to weigh up |
|---|---|---|
| Capsule | Masks the root’s bitter taste, standard men’s-health format | Fill weight depends on extract concentration |
| Tablet | Compact, easy to combine with other ingredients | Bitterness can affect chewable formats |
| Powder (stick or scoop) | Flexible dosing, used in some energy or vitality blends | Strong bitter taste needs flavour masking |
Decisions that shape the specification:
- Extract standardisation. Root extracts vary in concentration and marker-compound standardisation; confirm the specification matches the dose used in the trial you intend to reference.
- Amount per serving. The trials above used 100–200 mg of a standardised extract daily; match your target dose to a studied range.
- Companion ingredients. Tongkat ali is often combined with other vitality or sports ingredients. Every companion needs its own check against Japanese food law.
- Your market’s status for tongkat ali. Its status as a food ingredient, and any restrictions on sourcing or claims, differ between countries. Confirm before you commit to a formula.
The check that comes first
Every ingredient must be permitted in foods in Japan, or a Japanese factory cannot make the product.
Tongkat ali root clears this check under Japan’s non-pharmaceutical list. Companion ingredients in a combination vitality formula are where problems more often appear. See the Japan-made supplement OEM page, and compare with our maca and ginseng guides.
Before you ask for a quotation
A factory can quote accurately once the extract standardisation, the amount, the form and the packaging are fixed.
- Root extract standardisation and source documentation
- Amount per serving and servings per pack
- Dosage form and flavour-masking approach if powder
- Companion ingredients and their amounts
- Countries you will sell in, and tongkat ali’s status there
- First order and annual volume
💬 Ready to design a Japan-made tongkat ali product? Send us the concept — extract standardisation, amount, form and the countries you will sell in.
Frequently asked questions
1. Can a Japanese factory manufacture a tongkat ali product?
Yes. The root of Eurycoma longifolia is listed on Japan’s register of substances not judged to be pharmaceutical, following a March 2019 revision, so it can be manufactured as a food provided the labelling makes no medicinal claims.
2. What does the research actually show?
Randomised trials and a 2022 meta-analysis report increases in total testosterone with standardised root extract, most consistently at 200 mg daily, along with reduced fatigue-scale scores in one 12-week trial. The evidence base is still limited, with the meta-analysis pooling only 5 trials.
3. Is this evidence about sexual function?
No. The trials summarised here measured testosterone levels, fatigue and quality-of-life scores, not sexual function outcomes, and should not be described as sexual-health evidence.
4. Does the classification cover any tongkat ali extract?
The classification covers the root itself. A specific extract’s processing and standardisation still needs its own supplier documentation, and combination formulas need each companion ingredient checked separately.
5. What should I decide before asking for a quotation?
The extract standardisation, the amount per serving matched to a studied dose, the dosage form, any companion ingredients, and the countries you plan to sell in.
Sources: Japan Ministry of Health, Labour and Welfare, food-drug classification (食薬区分) register of substances not judged to be pharmaceutical, root of Eurycoma longifolia, revised March 2019; “Effect of Eurycoma longifolia standardised aqueous root extract on testosterone levels and quality of life in ageing male subjects: a randomised, double-blind, placebo-controlled multicentre study”, Food & Nutrition Research 2021, 65, PMID 34262417; “Eurycoma longifolia (Jack) Improves Serum Total Testosterone in Men: A Systematic Review and Meta-Analysis of Clinical Trials”, Medicina (Kaunas) 2022, 58(8), PMID 36013514. Checked on 25 September 2026.