Hello Thanks for writing to HCM The problem you are facing may not be due to folic acid as there is no documented evidence Sore nipples can occur for a surprising range of reasons like during menstruation,pregnancy,hormone imbalance etc To begin soothing your nipple pain, it s smart to try to determine its root cause. If you can determine the cause, you ll know what to treat to eliminate your nipple pain. If you can t determine a cause, you ll know that there s chance, albeit a small one, that your nipple pain is the sign of something more serious, and you ll know to go to a doctor. Hope i have answered your query. Get well soon.