How does Oveallgo ScalpReboost NMN Hair Growth Roller work? ThisOveallgo ScalpReboost NMN Hair Growth Rolleris formulated from natural extracts that are proven safe and gentle on your hair and scalp. Provides an adequate amount of nourishment that gets deeply into your scalp, it prevents scalp aging, stops hair loss, and boosts hair regrowth cycle it also improves the overall condition of your hair effectively, absolutely low cost and non invasive. Since the molecule composition of Nicotinamide Nucleotide is large, it is mostly difficult to be absorbed but our product is in serum form, thus making it lighter and 3x easily absorbed compared to other products. What makes the Oveallgo ScalpReboost NMN Hair Growth Roller so effective? Usage Directions: Specifications: Package Inclusion: