Nioxin Anti-Hair Loss Serum is a daily leave-in scalp treatment designed for thinning hair, sold in a 70ml size. Formulated with Sandalore, caffeine, lauric acid and niacinamide, it works to stimulate and nourish the hair follicles. It is said to help increase hair anchorage and improve hair resistance for fuller-looking hair from the first use. Apply 12-15 pumps to dry or damp hair and massage evenly across the scalp, then do not rinse.