Similar to Rene Furterer, Frédéric Fekkai’s line is designed to treat specific hair conditions (color treated, damaged, dry, normal). Their Protein Rx line, which is enriched with a unique blend of soy and milk proteins, has garnered a huge fan base, quite simply because it works. Even the shampoo is good (although a little goes a long way). The shea deep protein treatment is a miracle worker when it comes to revitalizing damaged tresses, though be warned, if you have natural hair, you’re going to end up using a lot of this product depending on your hair length and thickness. It’s great to use under a heating cap to ramp up the conditioning benefits. The Protein Rx PM repair cream is also good, although you should use only a few times a week as directed on the label. If your hair is sensitive to protein, it’s probably best to skip this treatment.