Recent reports show that populations around the world are suffering from vitamin D deficiency. The problem is widespread and increasing, with potentially severe repercussions for overall health and bone-fracture rates. There is also evidence that suggests vitamin D deficiency increases during the winter months because of decreased exposure to sunlight. USANA's Vitamin D supplement is formulated with maximum strength vitamin D to ensure you get the vitamin D you need throughout the winter months in one tablet.

Vitamin D is produced in the skin upon exposure to sunlight. During the winter months, many become vitamin D deficient because of increased time spent indoors.