Bioconcepts vitamin d3 2000iu contains vitamin d3 the sunlight vitamin which helps the body to absorb and utilise the calcium what is vitamin d vitamin d is a steroid vitamin a group of fat soluble prohormones which encourages the absorption and metabolism of calcium vitamin d is obtained from sun exposure unfortunately due to lifestyle changes many do not reach the recommended levels of sun exposure reducing the amount of vitamin d in the body food and vitamin supplements may help the