This may lead to elevated levels of “free” vitamin D in your body, which may travel inside cells and overwhelm the signaling processes affected by vitamin D. However, when vitamin D intake is extremely high, your levels can become so high that there isn’t any room left on the receptors or carrier proteins. Very little “free” vitamin D is available ( 1, 2). Usually, most of your body’s vitamin D is in storage, bound to either vitamin D receptors or carrier proteins. It travels inside cells, telling them to turn genes on or off. However, we know that the active form of vitamin D functions similarly to a steroid hormone. The exact mechanism behind vitamin D toxicity is complicated and isn’t fully understood at this point. ![]() ![]() In contrast to water-soluble vitamins, your body has no easy way to get rid of fat-soluble vitamins.įor this reason, excessive amounts may build up in your body. ![]() Healthcare professionals may also call it hypervitaminosis D. Vitamin D toxicity occurs when vitamin D levels in your body are so high that they cause harm.
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