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Dietary Supplement3rd Party Lab Tested in the USASafe - Heavy Metal TestedGMP CertifiedHow it works:Vitamin D a fat-soluble vitamin is essential to maintaining total body health yet is not found in many foods. It's needed daily to keep bones and teeth strong over your lifetime and to ensure the proper functioning of heart muscles and nerves - it even helps your blood to clot. A daily regimen of this D3 (cholecalciferol) is the best way to treat and prevent vitamin D deficiency whether from lack of sunlight poor nutrition chronic illness or aging.D3 5000™ offers support for healthy bones by maintaining normal blood levels of calcium and phosphorus thus promoting calcium absorption. It helps combat fatigue and assists the immune system with cellular growth regulation. An important formulation for those with low levels of vitamin D.