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I do give my DD vitamin D when I remember. We are at a moderately northern latitude but it is very overcast for much of the winter and she certainly doesn't get her 15 minutes of sunshine (or any sunshine) most days. There is some convincing evidence linking Vitamin D deficiency and multiple sclerosis and I have yet to see any suggestion that vitamin D supplements cause any sort of harm whatsoever. I agree it is better to get vitamins from food, but vitamin D doesn't come from food and humans didn't evolve for such northern latitudes, so it makes sense to supplement a little.