Naka Ultra Collagen M - Bonus Size - Hydrolyzed collagen type 1 sourced from fish skin provides a source of essential amino acid lysine to help in collagen formation. Contains non-essential amino acids alanine, arginine, aspartic acid, glutamic acid, glycine, proline, serine, tyrosine which are involved in protein synthesis. Collagen is the most abundant protein in the body and is key for all connective tissues. As we age, collagen becomes extremely important for bone health, joint health and supple and youthful looking skin.