Have you ever heard of autoimmune diseases? Or allergies? These occur when your immune system is “boosted” or in overdrive. Not a good thing, folks. I’m always surprised by how often people get impressed by this claim. Your goal should be to have a normal immune system with normal immune surveillance—not too high or too low (suppressed).
The best supplements for immune health—vitamin C, zinc, and yeast-based supplements—improve immune function and surveillance; they don’t turbocharge the immune system. I find it interesting that our newest cancer drugs, which are designed to help boost the immune system, have some autoimmune side effects where the immune system actually attacks various organs!
The Supplement Handbook - Mark Moyad