Riken Vitamin Co., Ltd.

Premium kombu variety from the waters around Rishiri and Rebun islands in northern Hokkaido. Distinguished by clarity and depth of dashi (less sweet than ma-kombu, more refined than hidaka). Traditionally the kombu of choice for Kyoto kaiseki cuisine and ceremonial-grade dashi. Production is allocation-constrained — annual harvest is closely controlled by local fisheries cooperatives. Used in premium dashi, soup base, and kombu extract for cosmetic moisturisation lines.

Fucoidan is a sulfated polysaccharide extracted from brown seaweeds, most commonly mozuku (Cladosiphon okamuranus) from Okinawa and kombu (Saccharina japonica) from Hokkaidō. Studied for moisturizing, immune-modulating, and antioxidant positioning. Sold as both a cosmetic ingredient and a functional food supplement.

Premium-grade wakame (Undaria pinnatifida) harvested in the Naruto Strait (between Tokushima and Awaji Island). The strong tidal currents in this strait produce wakame with thicker, firmer texture and brighter green color than other origins. Naruto Wakame is a designated regional brand under Tokushima's branding programme. The premium texture commands 2-3× the price of mainstream wakame in retail. Distinct from existing 'fucoidan' (which is the active component) and 'okinawa-mozuku-fucoidan'. Used in soup, salad, and as a feedstock for fucoxanthin / mineral-rich supplement extracts.

Brown seaweed (Sargassum fusiforme) traditionally consumed in Japan as a side dish (nimono, salad) and increasingly under regulatory scrutiny in some export markets due to inorganic-arsenic content. Mie, Nagasaki, and Oita are the principal commercial harvest regions, with imported Korean and Chinese supply also feeding the Japanese market. Calcium and dietary fibre profile drive nutrition positioning, but importers must navigate destination-market arsenic guidance — UK FSA advises against hijiki consumption, while Japan and most EU member states permit it with labelling.