Creatine

Considered a “Hair Architect” which rebuilds and strengthens hair structure from within. Improves mechanical properties of stressed/bleached hair. Protects against heat damage from hot/flat iron.Creatine is an amimo acid derivative with a low molecular weight which should enable it to penetrate
into the hair cortex. Due to its amino acid structure it can built bridges between different amino acids of the keratin fibers and increase the crosslinking. 

This will result in a decrease of fiber breakage and will improve the mechanical properties of hair.