Vitamin D is one of the few supplements that has been shown to be associated with a decrease in occurences of several types of cancer. Many people are deficiant in naturally prduced Vit. D. Your body need to be in direct sunlight to produce it and most of us aren't out in the sun enough (without sunscreen) for that. Let alone those of us who live in areas of the coujntry without a lot of sunny days. Supplements have been shown to make a difference and be effective. I have to grind up pills and flush them down my tiube because I can't swallow even the smallest and because of that I don't take tons of supplements but I take 800 IU of Vit. D everyday.

Nelie