PEPTIDE PREP™ pH-preserving shampoo is a cleansing shampoo with the patented K18Peptide™. Powerful with an optimized pH that is safe enough for everyday use. pH Maintenance Shampoo is a gentle shampoo that you can safely use often without upsetting the pH balance of the scalp. It provides a fantastic starting point for K18Peptide. pH: 4.0 – 5.0. Usage: 1. Gentle enough to use every time you wash. 2. Massage into hair, focus on scalp. 3. Rinse thoroughly.