Collagen is the main component of extracellular matrix, and the decrease of this protein is closely related to skin aging. However, collagen is synthesized by cells themselves using basic raw materials, rather than directly pulling out foreign collagen (see cell biology for details), so supplementing collagen by eating collagen-rich foods such as pig's feet (pig's hands/pig's feet-) is basically to find a placebo for yourself and let the skin absorb it directly through the mask, which will be ridiculed by your face-don't underestimate the stratum corneum on your face, and don't think that cells will directly swallow such a large molecule. First of all, the nutrient absorption organ is the small intestine, not the skin, and even the small intestinal mucosa responsible for "eating" absorbs small molecules.
Therefore, the collagen mask basically does not have the function of supplementing skin collagen. But it is not without its merits.
The paper "The Improvement Effect of Recombinant Human Collagen Mask on the Skin" published by China Institute of Clinical Medicine Skin Injury Repair 20 13 0 1 draws the conclusion that the skin moisture of healthy women increased, the oil decreased and the skin quality improved to a certain extent immediately and within one week. Human-like collagen is human collagen produced by bioengineering technology, so it can also reflect the role of collagen mask to some extent. Collagen mask does have a certain moisturizing and skin improvement effect, but its mechanism lies in forming a collagen layer on the face to prevent water from losing too quickly in the skin instead of being directly absorbed.