Becoming the co-owner and face of hair-care line Sienna Naturals has turned Issa Rae into something of a casual cosmetic chemist. The gifted comedic actor has found herself with a healthy obsession with ingredients. "I think ingredients are so important, specifically thinking about how the past products that I've used have all been primarily focused on styling," she told Allure shortly after joining the Sienna Naturals team for a rebranding. "I think, for me, it's been getting to the root of taking care of your hair, making sure that your scalp is healthy, [knowing the] ingredients, and making sure that you're not manipulating your existing texture or the existing oils in your scalp."

Star Product: "I tend to be lazy, so I need something that is going to last me a long time, going to make my hair feel soft like it's intended to," Rae told Allure, pointing to the Plant Power Repair Mask ($22) to do exactly that. "And I have dry hair and it can be brittle — this restores my hair to help it feel healthy again."