Before purchasing any Gemmist products, customers take a hair quiz that includes prompts beyond the standard questions about color treatments, thickness and texture. With shampoo and conditioner available, the women-owned brand also has a Scalp Balancing Bar on offer. Intended for use once a week, this paraben-free soap exfoliates and stimulates the scalp—removing build-up and invigorating hair follicles. Though sulfate-free, the bar works up a satisfying lather and smells delicious. It also comes packaged just in a little cardboard box, reducing your use of single-use plastic bottles.