Collagen

Collagen is a protein naturally found in your skin, joints, and bones, which your body produces from amino acids. As a supplement it is most commonly taken as hydrolysed collagen (powder or capsules), in which large protein chains are broken down into smaller peptides for easier absorption. Daily doses of 2.5–10 grams taken for at least 8 weeks show measurable but modest improvements in skin elasticity, hydration, and joint pain.