There are all kinds of things for sale to put on sore nipples. Most breastfeeding helpers agree that usually the best way to help sore nipples is to get good latch and treat any problems like infection or vasospasm. Many women that I talk with, though, say that ointments feel good to them. So it’s useful to know which ointments are probably harmless and which could be hazardous. The Environmental Working Group has a cosmetic safety data base, Skin Deep, where you can search for products by name and get information about their ingredients.