Vitamin d excess

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Taking very high doses of vitamin D supplements can cause vitamin D toxicity.

Vitamin D toxicity causes high levels of calcium in the blood.
People with vitamin D toxicity may lose their appetite, feel nauseated, vomit, and feel weak and nervous.
Doctors diagnose the deficiency by measuring levels of calcium and vitamin D in the blood.
Treatment involves stopping vitamin D supplements and giving the person fluids and sometimes drugs.

Taking very high daily doses of vitamin D—for example, 60 to 100 or more times the recommended daily allowance (RDA)—over several months can cause toxicity and a high calcium level in the blood (hypercalcemia). Levels of calcium become high because when levels of vitamin D are high, the following occur:

More bone is broken down than is reformed. (Normally, bones are continuously broken down and reformed—in a process called remodeling—to adjust to the changing demands placed on them.) As a result, calcium is released from the bone into the bloodstream.
More calcium is absorbed from food in the intestine.

People with vitamin D toxicity may have symptoms due to the high levels of calcium in the blood.