Author Archives: Tiwaporn

            Vitamin D deficiency, 25-hydroxyvitamin D less than 50 nmol/L, is common in the US population around 41.6% 1.  The main source of vitamin D is sunlight. During winter at latitudes above 40 degree N, people cannot synthesize vitamin D 2; therefore, food becomes the main source of vitamin D. The study presented that vitamin… Continue Reading