I also take Astragalus, it is a Chinese herb helps
boost your
immune system. A good Pro-biotic is an excellent think
to take, keeps good bacteria going in your system. I also like Grapefruit Seed Extract, you take this when you feel a cold or flu coming on. You have to take it right away though, otherwise stick with Astragalus. Fish Oil is excellent, CQ10 also. But you can get fish oil if you eat a lot of fish, if not take the supplement. Those are my favorites.