Melanie Palm, MD, is a board-certified dermatologist and cosmetic surgeon at Art of Skin MD in Solana Beach, California. (In acne products, for example, mandelic acid is sometimes combined with the beta-hydroxy acid salicylic acid for extra skin-clearing benefits, Dr. Palm explains.) It's completely fine to use mandelic acid at the same time as plain moisturizing ingredients, think things like ceramides or hyaluronic acid, says Dr. Hovenic. And because mandelic acid comes from almonds, those with severe tree nut allergies may also want to steer clear. We’re pretty sure that mandelic acid is something many more people will be going, well, nuts for sooner rather than later.