Best Collagen For Face, Skin, Bones, Joints, And Hair : Collagen is one of the most common proteins in our body. It makes up most of our bones, joints, cartilage, skin, and nails. Despite its prevalence in the body, collagen is not an ordinary protein. It belongs to a few types of protein, containing non-standard amino acids-hydroxyproline, glycine, proline, and lysine.
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