No. 4 Bond Maintenance Shampoo by Olaplex. Restorative shampoo for damaged, stressed, or chemically treated hair.

Olaplex introduces the follow-up to its iconic two-step professional treatment for restoring hair at home. It's a shampoo and conditioner that complements steps 1 and 2 (professional, in-salon treatment) and 3 (at-home maintenance).

This shampoo is suitable for all hair types and textures. Formulated with the brand's patented bond multiplier: the active ingredient Bisaminopropyl Diglycol Dimaleate. This component works by joining the sulfur and disulfide bonds in hair keratin, which are broken when subjected to aggressive treatments that alter the shape or color of the hair.

It provides daily hydration without weighing it down, repairs split or damaged ends, strengthens hair with each use, and restores flexibility and manageability while softening and adding shine to the fiber.

Vegan and respectful formula, free of parabens, sulfates, and gluten. Cruelty-free.