Collagen: What It Can and Cannot Do
The digestion argument against it turns out to be partly wrong — but the reason it works is not the reason it is sold.
Collagen
Eaten as protein, not absorbed as collagen — the amino acids are broken down like any other. What the trials suggest is that supplying glycine and proline in quantity supports the body's own synthesis. These pages cover what the evidence shows for skin, joints and gut lining, and what it does not.
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