K18 pH Maintanance ShampooAn optimized pH shampoo (4. 5 5. 5) helps prevent excess swelling of the hair cuticle to help reduce frizz, preserve color, and maintain health and shineespecially important for damaged hair. An optimized pH also helps preserve the scalp microbiome and is gentle enough to use every time you cleanse. 91% said hair feels healthier, smoother, and does not feel weighed down* Certified microbiome friendly: Scalp microbiome is preserved for a healthier