Thirteen Lune's Cofounder Shares Her Must Haves, From a Luxe Candle to Her Go-To SPF

"I'm really big about supplements because healthy skin, healthy balance really starts from the gut," Grieco explains. After consulting with Dr. Nigma Talib, her naturopath and author of "Healthy Skin Starts in the Gut," she started taking the Dr. Nigma Talib Healthy Flora Capsules ($65). One pill a day can help aid in digestion since it contains a lactic acid-producing probiotic. She explains, "I feel like our skin is the biggest revealer of what's going on, on the inside. When I'm really in balance with those supplements, healthy eating, and getting enough sleep, it all shows up in my skin."

Pro Tip: She likes to take the capsule an hour before bedtime. "I definitely feel like, as I'm sleeping, it's really giving me that gut repair I need. I notice I'm less bloated as well." She likes to keep these supplements in the refrigerator along with her eye cream and face rollers.