collagen

col|la|gen /k'ɒlədʒən/
[N-UNCOUNT]
Collagen is a protein that is found in the bodies of people and animals. It is often used as an ingredient in cosmetics or is injected into the face in cosmetic surgery, in order to make the skin look younger.
The collagen that is included in face creams comes from animal skin.
...collagen injections.

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