Collagen, accounting for about 20% of the total mammalian protein, is also a very important protein in the human body, mainly in connective tissue, and plant tissue does not contain this protein. It has a strong stretching ability, is a major component of ligaments, collagen is also a major component of the extracellular matrix. It keeps the skin elastic, and the aging of collagen causes the skin to wrinkle. Collagen is also the main component of the cornea of the eye, but it is composed in crystalline form.
Studies have shown that oral collagen can improve skin elasticity, moisture, and collagen density.

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