12 Hairstylists Reveal Their Favorite Products For Treating Thinning Hair

"Great hair begins with scalp health. When hair is thinning or there is significant loss, I've noticed that you'll have the best results if you fix the problem at the root. The Aveda Invati Scalp Revitalizer ($63) (from Aveda's three-part Invati system) prevents hair loss/fallout and increases hair thickness overall. I have seen amazing improvements in just two weeks with clients who have had thinning hair and use the spray regularly (applying to roots morning and night)." — Malhotra