A nightly, leave-in treatment for those wearing thin. Fattens and fortifies over time for thicker, stronger strands and fuller hair. Increases the thickness of each strand of hair (no fooling). Usage: Before bed, pump serum into palms 2 or 3 times. Work into roots and through damp or dry hair. If you have long hair, pump again and smooth through ends. For the ultra-fine, make this a twice-daily habit. Product Recipe: For really full results, pair with Thickening Shampoo, Thickening Conditioner and Thickening Hairspray.