Like bath bombs for your shower! Menthol crystals help reduce inflammation in your mucous membranes while imparting a cooling sensation. Baking Soda, Citric Acid, Corn Starch, Essential Oils, Cream of Tartar, Menthol Crystals, Isopropanol. Set them on a ledge where they won't get too wet, to keep them from dissolving quickly. (This product is vegan-friendly.)