Experience the power of Nioxin Hair Booster Serum, an advanced leave-in hair treatment designed to nourish and strengthen your hair from the root to tips. The treatment works by strengthening weak, fragile strands, promoting a healthy environment for hair growth.The Nioxin Hair Booster Serum protects the thickness of the hair strand and forms a protective barrier against hair damage to the follicle. Formulated with a Vitamin Complex, the serum is designed for progressed-thinning hair and works on specific areas of concern – such as a receding hairline or a low-density crown – and gives a warming sensation after application.How to use:Massage twice daily into areas of concern. Distribute through hair using fingertips, from the roots to the tips at areas of low density and along the hairline.If you are using a System Kit, apply the Hair Booster Serum before applying the Scalp Care + Hair Thickening Treatment from your System Kit.