Vitamin A

ahh, the cancer kicker, vitamin A is retinal, carotene, the beta carotene is the cancer prevention, this vitamin is top not only on list but at helping the immune system and to promote good general health.
What ever form you take follow the label instructions, try to avoid the "bargain basement" vitamins, it only goes in one end and out the other with little or no effect, so many fillers the body can't break it down.