DHC Collagen 60-day supply, 4 bags New and unopened Expiration date: 2028.04 3 bags 2028.03 1 bag Collagen is a type of protein made up of amino acids. It accounts for about 1/3 of the total protein in the body, and about 70% of the dermis, which is the source of firmness and elasticity, is made of collagen. DHC's "Collagen" contains collagen peptides derived from fish, along with vitamins B1 and B2 to support beauty and enhance its function.