Olaplex No 4 Shampoo, No 4c Shampoo and No 5 conditioner 33.8 oz each

The ingredient that changed it all. Known as the “invention,” the Bis-Aminopropyl Diglycol Dimaleate ingredient allowed professionals to reach new heights in color & care. Hair wasn't just healthier; it took on a completely different quality — blondes were brighter, brunettes more radiant, and redheads more vibrant