Koken Co., Ltd.
Self-described world leader in atelocollagen R&D since 1959; dominant in academic research and medical device OEM supply globally via AteloCell product line. Operates atelocollagen.com as a dedicated product portal. Almost invisible in English-language Western supply chain analysis despite likely being the largest single-company volume producer of purified atelocollagen globally. Sold primarily through Japanese distributors (Cosmo Bio USA for North American research).