If you’re looking to grow out your hair, Atkin suggests you start at the root. “Healthy hair starts at the scalp because if that isn’t healthy, your strands don’t stand a chance,” she says. “Keep your scalp nourished with a supplement that will provide you with vitamins and minerals essential to make hair grow thicker, healthier, and faster without breakage.” Look for ingredients like omega-3, vitamin B, iron, and biotin in a supplement, or try Atkins’ line of OUAI hair supplements ($28, theouai.com).