The news on vitamin D goes back and forth. One day its a miracle cure and the next study says it's bad for you. I personally have had what I feel to be very good results with vitamin D. I won't go into it deeply here but I feel that vitamin D brought back my immune system from the brink. If you have met me you know that I am quite pale skinned. For years I hid from the sun. And I feel this lack of D compromised my immune system. After taking D for a while I recovered. So I am a fan. And I tend toward believing that D is essential. Certain chronic diseases manifest more in higher latitudes, this is know. Mostly (and I follow it closely) the research results are good. If you can somehow get enough sun exposure to keep your levels high enough that is the ideal way. But as we age our skin is less able to make vitamin D from the sun. Keep this in mind. And also if you have darker skin it also harder to get enough sun exposure to keep your levels up.
Monte Jackson, owner Acupuncture Center of Richmond