Naka Pro Collagen M Extra Strength - Bonus Size - Provides the essential amino acid lysine, aiding in collagen formation and reducing joint pain linked to osteoarthritis. 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. Pro Collagen M Extra Strength helps support bone density and ease joint pain and inflammation.