| Ingredient | Studied for | Evidence in short | Usual form |
|---|---|---|---|
| Apocynum Leaf (Apocynum venetum) | Sleep quality and everyday stress | Small human trials; widely used in Japanese function-claim notifications for sleep depth | Tablet, capsule, drink |
| Ashwagandha (Withania somnifera) | Stress and sleep (medicine in Japan) | Not applicable — not permitted as a food ingredient in Japan | Not permitted in foods in Japan |
| GABA | Everyday stress; sleep quality | Independent review: limited for stress, very limited for sleep | Tablet, confectionery, drink |
| Glycine | Subjective sleep quality and next-day alertness | Small studies, mostly tied to one manufacturer, at around 3 g before bed | Powder stick, granule, drink |
| L-Theanine | Everyday stress; subjective sleep quality | A 2025 meta-analysis of 19 trials found real but modest subjective sleep benefits | Tablet, capsule, drink, powder stick |
| Lemon Balm (Melissa officinalis) | Everyday calm and sleep quality | Small trials, often in patient groups; general-population evidence limited | Tablet, capsule, tea, drink |
| Melatonin | Sleep (medicine in Japan) | Not applicable — not permitted as a food ingredient in Japan | Not permitted in foods in Japan |
| Saffron | Mood balance and sleep quality | Meta-analyses positive; trial quality rated low to moderate, sizes generally small | Tablet, capsule |
| Valerian (Valeriana officinalis) | Subjective sleep quality | Mixed across trials; a 2020 review found more consistent benefit from whole root material | Tablet, capsule, tea, drink |
Japan-made supplement OEM
Relaxation and sleep supplements made in Japan
Relaxation and sleep products are a fast-growing category in Japan, built on ingredients such as GABA, L-theanine, glycine and apocynum (rafuma) leaf. Most of the research uses subjective measures of sleep quality and everyday stress, and many trials are small.
This is also the category where overseas formulas most often fail Japan’s food–medicine check. Melatonin and ashwagandha are treated as medicines in Japan, and a formula containing them cannot be made as a food. The guides below cover both the evidence and the status.
Relaxation and sleep ingredients at a glance
What each ingredient has been studied for, how strong the published evidence is, and the usual dosage form.
“Studied for” describes research on healthy functions. It is not a claim that any product prevents, treats or cures a disease.
Before you choose a formula
Dosage form selection How tablet, capsule, softgel, powder, jelly, drink and gummy compare for a Japan-made supplement Export labelling and documents Japanese vs destination-market labels, over-labelling, country-of-origin rules, and factory documents to request Food-medicine boundary (食薬区分) How Japan's shoku-yaku kubun system decides food versus medicine status, and what it means for an export OEM order Starting a Japan-made supplement brand The steps from concept to launch for a brand that wants a supplement made in Japan
Frequently asked questions
Can melatonin be made into a supplement in Japan?
No. Melatonin is treated as a medicine in Japan, so a Japanese factory cannot make it as a food. The melatonin guide suggests food-permitted alternatives.
Which relaxation ingredients can be used in Japan?
GABA, L-theanine, glycine, saffron, lemon balm, apocynum leaf and valerian root can be used in foods in Japan, provided no medicinal claim is made. Each guide sets out the evidence.
How should a sleep supplement be described?
By what the ingredients have been studied for, such as sleep quality, not by any sleep disorder. We help keep the wording within your market’s rules.
Contact
Tell us what you want to buy or sell — in Vietnam or Japan
Selling into Vietnam or Japan, sourcing from either, or a product made under your own brand. One Japanese-managed team in Ho Chi Minh City, working in English, Japanese and Vietnamese.