We missed Vitamin D Day, which was observed on Nov. 2 in the U.S. We don't, however, miss our daily vitamin D3 supplementation, in part because of the education undertaken by the Vitamin D Council. In honor of Vitamin D Day, the executive director of the Council, Dr. John Cannell, released a three-minute video discussing the importance of moderate sun exposure and vitamin D supplementation. In it, Cannell says that supplementation is the "single most important thing you can do to take care of and improve your overall health," particularly as sunlight wanes in the northern hemisphere. His rule of thumb: If your shadow is shorter than you are, you are manufacturing sufficient quantities (assuming you bare enough skin to the sun); if it is more than twice as long as you are, you are not making much at all and require supplementation.
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