Vitamin D-3 1000 IU 100 Tablets from Source Naturals may help maintain healthy calcium and phosphorus levels in the body‚ may support increased muscle strength‚ and maintain a healthy immune response. Vitamin D-3 is one of the most useful nutritional tools for improving our overall health. Its main function is to maintain normal levels of calcium and phosphorus in the blood and this in turn helps muscles and the heart function efficiently. Sunlight is the life source on earth and has a lot of health benefits. It is the main source of vitamin D and because people these days spend more time indoors‚ there is an increase in cases of vitamin D deficiency. The body manufactures vitamin D-3 when the skin is exposed to the Ultra Violet radiation from sunlight‚ but this ability deteriorates with age. Vitamin D-3 (cholecalciferol) is the optimal form of vitamin D. The supplement from Source Naturals might prove beneficial‚ especially for older adults‚ in order to maintain strong bones. Vitamin D-3 can also enter cells and attach to specific receptors to control the expression of genes that regulate the functions of white blood cells and the cells within the intestine. The Vitamin D-3 1000 IU 100 Tablets from Source Naturals is hypoallergenic and contains no yeast‚ dairy‚ egg‚ gluten‚ corn‚ soy‚ wheat‚ sugar‚ starch‚ salt‚ preservatives‚ artificial color‚ flavor‚ or fragrance. These statements have not been evaluated by the Food and Drug Administration (FDA). These products are not meant to diagnose‚ treat or cure any disease or medical condition. Please consult your doctor before starting any exercise or nutritional supplement program or before using these or any product during pregnancy or if you have a serious medical condition.