A Complete Guide to the Best Olaplex Products — Including Those on Sale For Prime Day

Olaplex No. 4 Bond Maintenance Shampoo ($24, originally $30)

The Olaplex No. 4 Bond Maintenance Shampoo is a favorite among hairstylists. The shampoo can be used on damaged, dry, or even severely color-treated hair, and it uses a special technology to relink the bonds in the hair to ultimately make it stronger and healthier. It's great for all hair types, which we love. And to see the best results, the retailer simply recommends that users massage the product across their scalp and rinse it out with water once it's settled long enough.