This wonderful ointment is 0.3% Hydroxyquinoline Sulfate in a petroleum-lanolin base. This product is useful for nursing mothers who can also suffer from chapped nipples. If you use it, however, you must protect your clothing (a bra works) because the petroleum-lanolin can permanently stain. Also, the nipples need to be gently cleaned before nursing, then the ointment reapplied after each session.