Like many of Us, stars are all too familiar with the woes of hair thinning. Alyssa Milano said the Nioxin Scalp and Hair Thickening Shampoo "helped tremendously" after a bout with hair loss in 2020. Bargain hunters can snag the actor's go-to shampoo on sale for almost 50% off. See it! Enriched with a nourishing formula, this thickening shampoo strengthens hair from the root throughout the strands, promoting stronger, more hydrated tresses. Safe for dry, damaged and color-treated hair, this shampoo is filled to the brim with powerful ingredients.