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Generally, collagen type of skin is type I collagen
is describing all the tissues composed of collagen type II like cartilage, vitreous body and nucleus pulposus!
Collagen
No, collagen is a type of protein and retinol is a pure form of Vitamin A.
There does not appear to be an overdose risk to collagen supplements since it is water-soluble and is quickly eliminated from the body.
-kira :3