Q: I have MS and I've taken the medicine Copaxone. Last year, you said not to rev up my immune system with vitamins. Can you explain why and tell me what kinds of supplements are safe? - R.T., Decatur, Illinois
A: Imagine looking into the mirror, but instead of seeing your sweet self, you see a creepy robber and then start punching yourself, and it hurts. That's autoimmune disease - your immune system perceives its own tissue as an invader, then seeks to destroy it, little by little. With rheumatoid arthritis, the joints are primarily affected; with Hashimoto's, it's the thyroid; with MS, it's the brain and spinal cord nerves and so on.