Elderly people in this country, and I am one of them, apparently do not need vitamin D3. I say this, although my own doctor told me to take the vitamin. My evidence is based on the pill itself. Now a number of companies make this pill, and I believe that they do not all have the same point of view.
My pill manufacturer's D3 pills are tiny, and do they roll! They are almost round, and the "almost" factor makes them unpredictable in motion, like an American football or a rugby ball. They are hard to pick up, and super-hard to pick up when one is trying to grab several pills at once. When they escape and drop to the floor, they travel. Their ideal customer must have sharp eyes, be flexible and good at crawling under tables.
Today I weighed 218.6 pounds plus one vitamin D3 pill. Not bad.