What Else You Need to Know: Dirt, oils, product buildup, and metals—clear all the stuff that comes with dirty hair. This formula cleanses effectively in hard water, tackling common metals like nickel, cadmium, lead, zinc, and iron. The optimized pH of 3.8 to 4.2 minimizes swelling of the cuticle during washing and protects hair’s natural moisture levels. During shampooing, damaged pieces of protein can be washed out, creating holes and weakening hair’s structure—the K18PEPTIDE reduces this protein loss. Only 17 intentional ingredients and the K18PEPTIDE™ help maintain color with no fillers or deposits left behind for maximum results.