The cuticle of hair (the outer covering of “scales” over the inner fiber) is very rich in protein, especially cystine. The epicuticle (a protein and lipid-rich layer covering the cuticles) is rich in amino acids (smaller components of proteins). To temporarily repair damaged hair, protect porous hair and add body to fine/thin hair, look for products containing hydrolyzed wheat, soy, quinoa and keratin proteins and amino acids to add cystine to the cuticle for shine and moisture retention.
Protein Treatment for Damaged Hair
Protein-rich products can help restore the protein in your hair.