I wonder if you ever look at the ingredients list when shopping for skin care products?  I wonder if you found betaine in it?  You probably didn't know what betaine stood for or what it did when you looked at it, but you will if you read this article.  

Function 1: Unique moisturizing effect

Unlike glycerol, which holds water molecules in place, betaine allows water molecules to be fully absorbed and utilized by living cells, although betaine has the same moisturizing effect as glycerol.  When a water molecule sits between the amphoteric ions of betaine, it can easily release its own water molecules into the surrounding liquid.  Betaine is superior to other moisturizers in moisturizing mechanism and can keep moisture for a long time even at low concentration.  

Function 2: protect cell performance function When the skin is subject to the high osmotic pressure of the external environment, it will make the cell osmotic mass loss, resulting in cell apoptosis.  Betaine permeate inhibits this process and penetrates through the cuticle of the skin to protect cell balance.  

 Function 3: The anti-allergy effect of betaine added in shampoo can effectively reduce the stimulation of the surface active ingredients on the scalp, for the itching and dry hair after shampoo also improve the effect.  Betaine added to the fruit acid anti-aging products can significantly improve the low PH value of fruit acid to the skin irritation, but also reduce the occurrence of allergies.