D3 Natural is a natural vitamin D3 that is an important nutritional supplement to support bone and heart health. It is recommended for people who do not get enough sunlight, as it contributes to their ability to maintain normal muscle function. It is also recommended for those who suffer from a weak immune system, as it helps maintain normal bone and teeth health. D3 Natural plays a major role in maintaining appropriate calcium levels, which is an essential vitamin for preventing many health problems.