Native collagen is completely intact collagen. Native collagen is extracted from the skin of fish without heat, chemicals or acids, leaving the structure of the collagen intact. As a result, you need less to experience results (from 40 mg). Because no heat, acids or chemicals are used during the extraction process of native collagen, this is the purest and most pure form of Fish collagen. Skin for Skin has patented this unique extraction process and is therefore the only supplier of native fish collagen.