Stress sensing in the human greying hair follicle: Ataxia Telangiectasia Mutated (ATM) depletion in hair bulb melanocytes in canities prone scalp Scientific Reports Can You Reverse Grey Hair Caused by Stress? Here's What the Science Sa Arey Yes, we can reverse gray hair. No, we don't know why it works. Mashable DAY 34 100% Grey Hair Reverse Formula Hair that has already turned grey cannot be naturally reversed. However, progression can be slowed, new greys can be delayed, and overall hair quality