Question: what shampoo to use on keratin treated hair?
Answer: For lasting results, post-treatment shampoo should be free of sulfates (sudsing agents that can strip hair) or sodium (a thickener that dissolves keratin). Piet at Vartali Salon suggests Pureology ZeroSulfate SuperSmooth, L'Oreal EverPure Sulfate-Free Colorcare System, and Keratin Complex by Coppola Keratin Care.