I brought this Vit D3 for general health & well being. The size of 2000IU is ideal which is not too low & not too high, as I live in a tropic country. It's also contained a small amount of calcium, which will be useful when not taking additional calcium supplement. I believed it is good for healthy bone and boosting immunity. It is my replacement for not getting enough sunshine which is needed for the body to produce Vit D3.