Small-molecule humectants have a smaller molecular weight, less viscous, and stronger permeability, because the human epidermis has 5 layers (stratum corneum, transparent layer, granular layer, spinous cell layer, basal layer. There is no transparent layer on the face.), Each layer has its own functions and characteristics (including resistance and protection functions), the smaller the molecular weight, the deeper the penetration.
Small-molecule products can penetrate deeper. When we use skin care products, we should use small-molecule products first, and then macromolecular products.For example, First, applying a small molecule hyaluronic acid essence to the face, massage and absorb it, so that it penetrates into the basal layer to replenish hyaluronic acid. Because hyaluronic acid can naturally survive in the basal layer, it can slightly expand capillaries, increase blood circulation, improve intermediate metabolism, and promote skin nutrition. The absorption of the skin makes the skin moist, smooth, delicate, tender, and elastic, and then use the macromolecular product of lotion and cream to moisturize and lock water. Both large molecules and small molecules have their own characteristics and functions, and they are indispensable.