Do you need more vitamin D?
Right now, it would be premature to double down on vitamin D supplements. "There is a history of individual nutrients, taken at higher doses than obtained from diet alone, looking like the new cure-all, but then the confirming studies don't demonstrate that," says nutrition researcher Howard Sesso, an associate professor of epidemiology at the Harvard School of Public Health. "Experience tells us that we don't really know that it's safe and it works until we do a definitive clinical trial."
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