Collagen type I (native) is a protein found in skin, blood vessels, and other tissues. Most collagen type I in supplements comes from cows. But it can also come from eggshell membranes, pigs, fish, and other sources.

Collagen type I is most commonly used to support healthy skin, hair, and nails. It has been investigated for osteoarthritis and a condition called scleroderma. But there is no good scientific evidence to support any use.

Don't confuse collagen type I (native) with collagen type II (native), collagen peptides, or gelatin.

How does it work ?

Some experts believe that taking collagen type I by mouth may reduce overproduction of collagen by the skin. But these theories are unproven.
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