Collagen type I (native) is a protein found in skin, tendons, ligaments, and bone. Most collagen type I in supplements comes from cows.

Collagen type I plays a major role in wound healing. But it's not clear if taking collagen type I by mouth has any beneficial effects.

People most commonly use collagen type I to support healthy skin, hair, and nails. It's also been used for osteoarthritis, scleroderma, and many other conditions, but there is no good scientific evidence to support these uses.

Don't confuse collagen type I (native) with collagen type II (native), collagen peptides, or gelatin. These are not the same.
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