Mushrooms are going mainstream. We’re not talking about the sort you’ll find on your pizza ai funghi, or the magical kind. Nope, the type that have TikTokers all hot under the collar are called functional mushrooms: Think mushroom face creams at Ulta Beauty or chaga lattes at your local coffee shop. “These are mushrooms that have a medicinal or therapeutic effect in the body,” says Kate Denniston, a Los Angeles–based licensed naturopathic doctor trained in both conventional and functional medicine.