Yotsuba Japan / The ingredient library
The ingredient
comes first.
From Japanese botanicals to carefully selected nutrients. Discover what goes into our formulas — and find the products that bring these ingredients together.
EXPLORE A COLLECTION
Fermentation, in its different forms.
Discover fermented raw materials and bacterial ingredients, then follow each one into the Yotsuba formulas that contain it.
Fermented ingredients follow the preparations declared in our formulas. Cultures and postbiotic ingredients are shown as a separate group; their preparation and evidence differ.
Directions reflect the Yotsuba formulas in which an ingredient appears. They are a way to explore the collection, not a claim that every ingredient independently provides that benefit. This index covers the highlighted active ingredients and declared complexes on our product pages. Forms and specifications vary; the complete product page remains the reference.