revivogen shampoo for hair growth and hair thickeningit removes Sebum (which blocks DHT near the hair follicle) and even DHT (powerful androgen linked to hair loss) to some degree from the scalp. Hair Thickening Shampoo formula helps to relieve irritation and delivers important bio-active nutrients to create a healthy scalp environment for hair rejuvenation. It also will add extra volume to limp hair and extra shine to dull hair.