For damaged hair. pH 4.5-5.5. MWS 150-2500. Quadramine complex. Joico's original intensive protein Reconstructor for dry and damaged hair rebuilds and improves the structure of hair. PH 4.5 to 5.5. Contains quadram1ne complex an exclusive blend of low molecular weight and size proteins (MWS 150-2500). This balance of 19 essential amino acids (the building blocks of hair) adheres quickly and effectively to ensure maximum protection and reconstruction from the cuticle to the cortex. Color-safe. Made in USA.