DHC 20 Days collagen contains fish-based collagen peptide and vitamin B1 and B2. Collagen is a type of protein rich in amino acids, it supports skin regeneration and creates a smooth texture for the skin. It is effective in delivering a youthful elasticity and smooth texture, which enhance fresh and supple beauty. The product helps improve skin quality and maintain moisture in your skin. Although the amount of collagen is low at 2000mg, vitamin B1 and B2 are added to make it a nutritionally balanced supplement.