Oganic osmotic substance is a kind of chemical substance which can maintain the metabolic specificity of cells and resists osmotic working pressure to stabilize large molecular formula .Such as sugar、polyether polyol 、carbohydrate and compounds, etc.Betaine is just a vital organic osmotic substance.Nowadays the research shows that the content of betaine in microbial cells is higher under the drier or saltier natural environment.

Skin cells change the concentration of osmotic substance inside the cell on base of accumulation or release of organic osmotic substance,and thus  dynamically maintain the volume and water balance of the cell.

When the external high osmotic pressure such as skin epidermis desiccated or exposed to ultraviolet radiation, it will cause a lot of outflow of osmotic substance in skin cells, and then lead to apoptosis of skin cells, and betaine osmotic substance can significantly inhibit the whole process.

Betaine applied in cosmetic grade can maintain the permeability balance of cells as an organic permeable substance according to the penetration of the skin cuticle,and then improve the surface moisture content of the skin.Betaine's unique moisturizing principle makes its moisturizing properties different from those of common moisturizers.