It's compounded by a local pharmacist. It contains zinc oxide, a magnesium based antacid(like Mylanta), an antifungal cream(like miconazole or clortrimazole), & vitamin cream(like A&D). The zinc oxide is a skin protectant. The antacid helps prevent skin irritation from acidic drainage from the yeast & helps to inhibit yeast & bacterial growth. The antifungal use needs no explanation. The A&D cream also helps to inhibit yeast & bacterial growth. I'm not certain if those are the only ingredients used to compound the Keesler cream. But, those are the main ingredients. A pharmacist shared this info with me at a hospital I once worked at.