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For the study, researchers at Waseda University in Japan and Shanghai University of Sport in China looked at whether supplementing with vitamin D for a year would improve insulin resistance.
They hypothesized that improved 25-hydroxyvitamin D (25[OH]D), also known as calcifediol, status after vitamin D supplementation for one year would significantly improve insulin resistance. Calcifediol is the main circulating metabolite of vitamin D3 produced in the liver. It is also the best indicator of vitamin D stores in the body. Earlier studies have shown that higher circulating 25(OH)D is associated with a lower prevalence of insulin resistance and Type 2 diabetes...read more>>>>.....