"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.

Dirt builds up in the scalp, so it becomes necessary to clean it with frequent scalp detox. This guide has you covered.

"When I was doing press for Z: The Beginning of Everything, [the stylists would use] all of this different stuff and it would make my hair so gross, so I'd use the Christophe Robin Cleansing Mask ...