Our hair care roller serum is carefully formulated from glycerin and 1,2-hexanediol. It is specially designed to nourish the hair from the root, enhance hair toughness, and support long-term hair health maintenance. The method of use is extremely convenient: take a bottle of serum, open it, pour it into the roller device, put the microneedle head on the bottle, and use the roller to roll evenly on the scalp. And it keeps the hair roots hydrated, supporting thicker and healthier hair.