"When thinking about hair growth, you need to take a whole-body approach and address the root causes," says dermatologist Dr.

The definitive roundup of the 100 greatest hair products as chosen by the people who know best – beauty industry insiders.

Learn more about the reparative mask that earned a spot on our list of the Greatest Hair Products of All Time.

Promising review: "Love this hair mask. My hair is recently processed and a little frazzled. This mask made it soft and ...