BRAND NEW NEVER OPENED. A lightweight, leave-in treatment for hair thinning — thicker, fuller-looking hair in 90 days. Scalp Science The scalp microbiome is extremely delicate and has a low barrier function, meaning it has difficulty maintaining moisture and is highly susceptible to oxidative damage. This damage can directly disrupt the hair growth cycle, causing thinning, shedding, and premature hair loss. Our Stem Cell Scalp Serum is rich in phytonutrients that have been studied and shown to have incredible longevity properties, revitalizing hair stem cells and protecting the scalp microbiome. With the added benefits of Aloe Vera (1%) and Bamboo Extracts (2%), this scalp treatment works to hydrate the scalp to provide the optimal environment that supports hair follicle health and fortifies roots for fuller + thicker feeling hair with overall less shedding. Size: 2.2 fl oz (2 month supply)