Many people believe that additional Vitamin C will ward off the common cold. Again if this is not taken in conjunction with an healthy food intake, there will be no substrate for the vitamin to act as a cofactor for. In other words without a correct diet, the extra vitamin already found in fruit will be useless. And what about Vit D supplements now found in milk which allows for the absorption of calcium. To much of this would result in too much calcium reabsorption and the result of brittle bones. And of the increased presence of Vitamin E in adult vitamins? Who id to say that the increased dosage compare to that found in regular tablets is going to benefit the user. Also where drug companies mention the I.U. or international unit, wouldn't this just be an arbitrary figure that may vary from one pharmaceutical to another based on their latest findings? So as to which company is marketing the right dosage, I wonder sometimes.