Made Up of Amino Acids Glycine, Proline, Hydroxyproline and Arginine. Help With Firmness and Elasticity. Features: Provides the Building Blocks of Our Skin. | Collagen Serum | WowcherMade Up of Amino Acids Glycine, Proline, Hydroxyproline and Arginine. Help With Firmness and Elasticity. Features: Provides the Building Blocks of Our Skin. | Collagen Serum | Wowcher