#1 Vitamin D
One of the most beneficial and yet least expensive supplements available, vitamin D has the ability to cut the rate of cancer dramatically. Some experts report that it could be as high as 50 percent successful. Vitamin D is also recognized as essential for good heart health and for bone health; and like vitamin C it is also a good protection against colds and flu. While you might get sufficient vitamin D from the sun, and from certain foods including fatty fish like tuna, mackerel, salmon and trout, Portobello mushrooms, egg yolks, liver and cod liver oil, a vitamin D supplement is usually a good idea for most people.