Interpretation of the truth:

Collagen is an important structural component in mammals, accounting for about 30% of the total protein in mammals. Collagen is widely found in skin, cartilage, tendons and ligaments, and plays a role in supporting organs and protecting the body.

In skin, collagen accounts for 70% of the dry weight of human dermis. Collagen is the main substance supporting epidermis and dermis, and the decrease of its quantity or density is the main reason for the collapse of skin structure, the decline of skin elasticity and the formation of wrinkles on skin surface.

The reduction of collagen is one of the factors of skin aging, so can the collagen lost from skin be supplemented by oral administration? The answer is no.

First of all, the ingested collagen can not be directly absorbed by the human body, but is decomposed into tiny amino acids by digestive juice in the intestine before being absorbed by the intestine. After these amino acids enter the human body, their whereabouts are unknown, and they will be randomly transported to various organs and tissues, and only a small part will be transported to the skin.

In other words, eating collagen is the same as eating eggs, and finally it is decomposed into the same thing (amino acid) in the intestine, and only a small part is given to the skin after being absorbed by the human body. Therefore, oral administration of collagen can not achieve the effect of "what to eat and what to make up".

In addition, the amino acids that make up collagen are non-essential amino acids for human body, which can be synthesized by human body itself, so the focus of research now is not how to supplement collagen, but how to stimulate skin to regenerate collagen. At present, the commonly used medical beauty techniques include hot Maggie and ultrasonic scalpel, which can stimulate the skin to regenerate new collagen.

To sum up, eating trotters to supplement collagen is also self-defeating. First of all, under a normal diet, the human body does not need to supplement collagen. Even if pig's trotters are eaten as a kind of food, protein is supplemented, and it cannot be completely reduced to the expected collagen.

Rumor expert: Attending physician of Tongren Hospital affiliated to Chen Xue Capital Medical University.

Expert: Chief researcher of plastic surgery, First Affiliated Hospital of Zhengzhou University, Liu Ling.