Can You Reverse Gray Hair? Understanding the Role of Vitamins Finding grey hair in your 20s or 30s may not be just a matter of age or genetics; health experts indicate that nutritional deficiencies play a significant role in premature greying. Research 1 in 3 people under 30 have premature greying , Most of them are B12 deficient , Your hair didnt age your mitochondria did., #B12Deficiency Grey hair isnt age, its a signal., Your cells are Gray Hair Reversal: Can You Actually Reverse Grays?