What it is: A leave-in hair serum that prevents breakage and repairs hair. What it does: This potent, water-based leave-in serum is infused with Biotin (vitamin B7) and a rich vitamin cocktail of B3, B5, B6, C, and E to nourish the scalp and hydrate and strengthen hair while energizing follicles. A unique deep-penetrating technology enhances the deposit of healthy hair growth actives down the follicle to facilitate absorption of nutrients and speed repair to damaged hair. Silk amino acids penetrate and moisturize for instantly softer, silkier hair. With continued use, hair becomes stronger, resistant to breakage, and healthier looking.