K18 | Damage Shield Protective Shampoo & Conditioner Duo [31.5 oz]K18 Damage Shield Protective Shampoo is a color safe shampoo that effectively cleanses while maintaining hair health and protecting it from damage. Its pH optimized formula helps reduce excess swelling of the hair cuticle during washing, preventing frizz and preserving color. This shampoo contains the patented K18PEPTIDE, which enhances shine and makes the hair more resilient. It is also scalp microbiome friendly and gentle enough to use every time