Our MSM + Caffeine Supercharge Hair Growth Serum is a concentrated yet lightweight scalp serum powered by MSM, caffeine, green tea, rosemary, and peppermint to refresh and stimulate the scalp, support stronger, more-anchored hair roots, reduce hair fall and breakage, and encourage regrowth and fuller, more healthier hair. Formulated with a base of propanediol (a plant-derived humectant), water, and hyaluronic acid, our serum is gentle enough for sensitive scalps while still delivering effective nourishment.