Silk Amino Acid contain 18 different amino acids from the cocoon of the silk worm. These amino acids have a chemical composition that is very close to that of human skin and hair making them a wonderful source of nutrition and help to revitalize. This type of silk is very fine giving it a high dispersion rate in liquids or into other powders and good penetration into skin and hair. It is especially good for use in hair care products, as it protects hair from moisture loss and conditions it to provide a silky smoothness. Silk Amino Acid can be used in a wide variety of products such as shampoo, conditioner, hair treatment, body wash, body lotion, cleaner, toner, makeup foundation, lipstick, mascara, color cosmetics. Recommended usage rate is between 2-5% by weight. External Cosmetic Use Only.