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About Dr William Grant

Dr. William Grant is an epidemiologist and founder of the nonprofit organization Sunlight, Nutrition and Health Research Center (SUNARC). He has written over 140 peer-reviewed articles and editorials on vitamin D and health. Dr. Grant is the Science Director of the Vitamin D Council and also serves on their Board. He holds a Ph.D. in Physics from UC Berkeley.

Author Archives: Dr William Grant

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Low vitamin D status may affect menstrual cycle length in women

A recent study determined that lower vitamin D levels are associated with a nearly 3 times increased risk of longer menstrual cycles.

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