No two heads of hair are exactly the same, so why use a one-size-fits-all shampoo and conditioner? Function of Beauty ($36 for 8 oz. each shampoo and conditioner, functionofbeauty.com) brings the bespoke experience to your bathroom. Its online quiz delves into your texture, scalp condition, and ultimate hair goals to custom-blend a tailored formula. You can choose the color and scent, or go dye- and fragrance-free. The result is shipped out with your name printed on the bottle, because it was made by you—and for you.