Collagen and collagen peptides are both popular supplements for skin, joints and hair health. But which one should you take?

Most collagen supplements are made from cow or chicken, though marine collagen from fish is also available. The United States Food and Drug Administration (FDA) doesn't regulate collagen or whey ...

Collagen comes in several different forms, from pills to powders. You'll also need to chose between bovine or marine formulations, and these days there are even vegan options available.