This serum helps to restore any scalp suffering from effects of sun damage and pollution while supporting the reduction of hair thinning, dryness, and fallout.This serum helps to restore any scalp suffering from effects of sun damage and pollution while supporting the reduction of hair thinning, dryness, and fallout. Founded by celebrity hair stylist Helen Reavy, Act + Acre is rooted in the belief that great hair starts at the scalp. Creating and patenting the Cold Processed® method, the result is a nutrient-rich formula that leads to stronger, more resilient hair health.