A zinc oxide diaper ointment with no added fragrance. There's no water in the formula, so it doesn't need a preservative.
Along with vitamin-grade zinc oxide, it contains purified lanolin, coconut oil and licorice. Note the lanolin comes from sheep's wool. Apart from the zinc oxide, it's USDA Certified 100% Biobased.
California Baby lists it as cloth-diaper safe. It's also HSA/FSA eligible; check with your plan provider.