Reverie Cake Restorative Scalp Tonic Not only does the essential-oil-packed Reverie Cake Restorative Scalp Tonic ($72) protect the scalp from environmental stressors and rebalance its pH when left in, but it also uses Swiss apple stem cells to delay follicle ageing (and thus also support hair growth). Image Source: sephora.com Reverie Cake Restorative Scalp Tonic $72 from sephora.com Buy Now