Phosphorus is a chemical element with symbol P and atomic number 15. As an element, phosphorus exists in two major formsâ white phosphorus and red phosphorus âbut due to its high reactivity, phosphorus is never found as a free element on Earth.Instead phosphorus-containing minerals are almost always present in their maximally oxidised state, as inorganic phosphate rocks. White phosphorus, called WP (slang term Willie Peter) is used in military applications as incendiary bombs, for smoke-screening as smoke pots and smoke bombs, and in tracer ammunition. 2  It is also a part of an obsolete M34 White Phosphorus US hand grenade.
This COULD cause an indigestion like experience. So, the BEST choice for a Vitamin D Supplement is one that is made with Vitamin D3 and is prepared either 'Dry' without oil or is prepared with coconut oil (also called MCT or medium chain triglycerides) that doesn't go rancid.
One study however shows that taking calcium supplements containing vitamin D can cause gastritis, especially when such supplements are taken in between meals. The symptoms of gastritis simulate that of rebound acid production, which feels like heartburn. But the incidence of this is very low.