I've been doing alot of research, and a number of trails point to these as being very health-ful:

Cellfood (or H2O2 or ozone therapy)
Immune 26 (or perhaps also colostrum)

I haven't tried either yet, but I have ordered Cellfood as well as colostrum (colostrum is much cheaper than Immune 26, though not clinically proven that I know of).