Does the skin normally absorb nutrients?

In addition to clothing, the topic that women are most concerned about today is skin care, because it is related to women's appearance. Whether the skin can absorb the nutrients contained in cosmetics is the most important thing for women today and also the most in-depth issue. Many people buy a lot of expensive cosmetics, but their skin is not necessarily very good. Today, the editor will answer this big confusion of yours.

Under normal circumstances, the "nutrients" added to cosmetics cannot enter the skin.

The top layer of the skin is the stratum corneum (composed of dead cells), which is firm and tight and can effectively prevent the invasion of bacteria, harmful chemicals and pathogens. On the surface of the stratum corneum, there is a thin film composed of lipids and other substances. Therefore, the skin is impermeable, which can prevent water from penetrating into it and also prevent the loss of water in the body. Under normal circumstances, nutritional additives in cosmetics cannot enter the skin.

Speaking of this, we should also emphasize the concept of absorption. The concept of absorption in pharmacokinetics refers to the process of drugs entering the blood circulation from the site of administration; and for the absorption of nutrients, we can look at the example of the small intestinal wall. The surface area of ​​the small intestinal wall of an adult is about 200 square meters. Water, inorganic salts and various nutrients enter cells and blood circulation through the cell membrane by free diffusion, assisted diffusion and active transport. Visible absorption requires the target molecule to enter cells or blood circulation.

In order to absorb nutrients through the skin, they need to diffuse through the stratum corneum. The nutrients in cosmetics (such as macromolecules like proteins) cannot pass through the stratum corneum and therefore cannot be absorbed by the skin. Even if the particles are small enough, diffusion in the stratum corneum is selective.

According to what is said in the above article, the skin cannot absorb nutrients. In fact, the main nutrition of the skin is provided by internal absorption, so the epidermis cannot absorb real nutrients. Therefore, the editor hopes that everyone will not abuse cosmetics casually. If you want to have beautiful and delicate skin, it is best to pay more attention to these two aspects: diet and lifestyle habits.