| Ingredient | Studied for | Evidence in short | Usual form |
|---|---|---|---|
| Aojiru (barley grass, kale or ashitaba green juice powder) | Fibre intake; general wellbeing markers | Limited and plant-specific; strongest data are small trials on single plants | Powder stick, drink |
| Beta-glucan | Gut fermentation and microbiota markers; immune-response markers, depending on source | Differs sharply by source; oat/barley and yeast/mushroom types are not interchangeable | Powder, capsule, tablet, cereal or baked format |
| Dietary fibre (indigestible dextrin / resistant maltodextrin) | Bowel movement frequency and stool volume | Consistent trial evidence for bowel movements; most trials industry-funded | Powder stick, capsule, drink |
| Lactic acid bacteria / bifidobacteria | Bowel regularity and gut environment | Depends on the strain; results for one strain do not transfer to another | Capsule, powder stick; heat-treated cells in any form |
| Prebiotic oligosaccharides (FOS, GOS, inulin) | Bowel regularity and gut bacteria composition | Meta-analyses report modest, consistent effects on stool frequency; results vary by type and dose | Powder stick, drink, capsule, tablet |
| Psyllium husk | Bowel regularity | Meta-analyses support bowel regularity at higher doses; must be taken with adequate water | Powder, capsule, sachet |
Japan-made supplement OEM
Gut health supplements made in Japan
Japan has a long history of lactic acid bacteria and fibre foods, and many Japanese gut products use specific strains, heat-treated bacteria or indigestible dextrin. The key fact for bacteria is that evidence belongs to a strain, not to a species.
Gut ingredients raise practical questions too: live counts at the end of shelf life, moisture-proof packaging and tolerance at higher fibre doses. The guides below cover the evidence and the formulation.
Gut 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
Why does the bacterial strain matter?
Results differ between strains of the same species, so evidence for one strain cannot be used for another. Choose a named strain with its own studies.
Should live bacteria or heat-treated cells be used?
Live bacteria need protection from heat and moisture and a guaranteed count at the end of shelf life. Heat-treated cells are more stable and fit more dosage forms. The lactic acid bacteria guide compares them.
What packaging do gut products need?
Live bacteria and hygroscopic powders need moisture protection, such as blister packs, aluminium pouches or bottles with desiccant.
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.