A block of talc. Talc is a metamorphic mineral that results from the metamorphism of magnesian minerals such as serpentine, pyroxene, amphibole, and olivine, in the presence of carbon dioxide and water. This is known as talc carbonation or steatization and produces a suite of rocks known as talc carbonates.
Vitamin D does this so effectively that studies have shown it can reduce inflammation by anywhere up to one third making it just as effective as many medicines available over the counter. As well as stopping inflammation, regular consumption of vitamin D-rich foods can help reduce pain and stress on joints.
Because your skin makes vitamin D after exposure to the sun, you may believe that you'll always have a sufficient supply. But that assumption is not necessarily true. Sunscreen, reduced time in the sun and limited dietary sources of vitamin D all conspire to put you at risk for a deficiency. Even if you do produce or consume enough of this vitamin, you may still be at risk for vitamin D depletion.