Just about everybody is deficient in Vitamin D in winter, and many are severely deficient. Muscle weakness,
In summer when the sun is intense enough, we make this "sunshine vitamin" out of circulating cholesterol when the sun's rays hit our skin and eyes, but the intensity of winter sun is not strong enough to do the conversion. This is because the extremely indirect angle of the sun in winter diffuses solar energy such a wide area that any given point on earth receives only a fraction of summer sun intensity.
-Vitamin D has to build up in the body, it doesn't happen all at once. But you can definitely feel the effects as your stores increase. Having said that, you can't just chug it because the body can only absorb so much at a time. The best approach is to buy the highest possible dosage and take 1 in morning and 1 at night, maybe even one more in afternoon until you feel it build up.
-The FDA had long kept the maximum Vitamin D allowed in supplements very low. They finally changed this a few years ago, so now you can get the dosage you really need.
-"My vitamin pill says it has 100% of Vitamin D." Not even close to enough. We absorb a fraction of the vitamin supplements we take.
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