Regenerate your scalp’s protective moisture barrier and boost visible hair density with our 3-in-1 scalp serum. 3-in-1 scalp serum to help regenerate your scalp’s moisture barrier • Moisturizes, fortifies roots and boosts visible hair density • Formulated with prebiotic glycerin, niacinamide, zinc and peptides • 89% women saw thicker and stronger hair* • Developed with dermatologists • PETA-Approved Vegan and cruelty-free *Independent clinical trial with 74 women over 90 days Your scalp is the source of your hair’s natural strength, but external factors can weaken its natural protective moisture barrier and cause breakage. That’s why our Density Boost Scalp & Hair Serum is formulated to regenerate your scalp’s protective moisture barrier and fortify your roots. This hair density serum combines clinically proven skin care ingredients to visibly improve hair fullness. Niacinamide strengthens the scalp's protective moisture barrier, prebiotic glycerin cares for the scalp microbiome and boosts visible hair density, while zinc with peptides strengthens roots. It is the final step in our three-part hair density system, so you can enjoy thicker, stronger and fuller-looking hair that feels nourished and revitalized.