Puritan's Pride Vitamin D3 250 mcg (10,000 IU) in 100 capsules

Vitamin D for Immunity Vitamin D is a fat-soluble vitamin that can be obtained from food or synthesized in the skin under the influence of sunlight. Vitamin D3, the form of vitamin D that forms in the skin, is a potent and active form of the vitamin. Vitamin D2 is a version of vitamin D that forms in plants, fungi, and yeasts during photosynthesis. While vitamin D2 is sometimes used to fortify foods, Puritan's Pride supplements provide the active form. Vitamin D plays a regulatory role in the growth, differentiation, and proliferation of various types of leukocytes. It's essential to regulate these processes to maintain immune balance. Consider a thermostat set at 70 degrees. When the temperature drops below 70 degrees, the heating turns on, but as soon as the temperature is reached, the heating must be turned off, otherwise the temperature will continue to rise indefinitely. A similar delicate balance is necessary for our immune system to maintain optimal health. T-cells and B-cells of the adaptive immune system are regulated by vitamin D. Many cells of the innate immune response also require vitamin D, such as monocytes, which need it for proper maturation. Adequate concentrations of vitamin D are also necessary for the synthesis of important proteins with immunomodulatory properties. Directions for Use: Adults should take one (1) softgel daily, preferably with a meal. Other Ingredients: Safflower oil, gelatin, vegetable glycerin, sunflower oil.