Vitamin D is an essential vitamin found in cells throughout the body. Necessary for calcium and phosophorous absorption, vitamin D is essential to maintain strong teeth and muscles, and support a healthy immune system. Although vitamin D3 is made naturally when bare skin is exposed to the sun, many adults do not get their recommended amount of vitamin D3 from sunlight alone. MediBest's Nano D3 drops can help make up for vitamin D3 deficiency. Add a drop to your food our water every day and help build strong bones and muscles year-round. Feel your best with MediBest.