Hello good morning The swelling could be due to an allergic reaction to something in the supplements which had decreased once you stopped taking the supplements. It could also be due to a nonvital(dead) carious (cavity) tooth in your mouth and since it doesn't pain you would have not come to know of it. I suggest you visit a dentist m only after proper examination of the swelling by a trained professional can the cause of the swelling be identified and treatment can be started. Regards