Leave-in, 100% drug-free formula addresses the underlying causes of sudden, temporary thinning hair. Infused with natural key ingredients, this potent serum helps preserve the scalp’s natural balance, stimulate the anagen phase and strengthen hair. How to use - Use once a week for three months. Snap the top of the ampoule off and attach applicator. Apply the entire vial to a clean, damp scalp section by section. Massage scalp to encourage product penetration. Do not rinse. Proceed to styling. For best results, continue to use on an ongoing basis.