Kiehl's Since 1851 Nourishing Olive Fruit Oil Shampoo
Like a smoothie for your hair, Kiehl's Nourishing Olive Fruit Oil Shampoo ($19) contains olive fruit and avocado oils, along with lemon extract, to lock in moisture and promote shine. It's the number-one-rated shampoo on the brand's website and carries a five-star rating at Sephora.