Are there any side effects to taking too much vitamin d?

Rare-TOXICITY: Vitamin d toxicity, also called hypervitaminosis d, is a rare but potentially serious condition that occurs when you have excessive amounts of vitamin d in your body. Vit d toxicity is a buildup of calcium in your blood (hypercalcemia), which can cause symptoms such as poor appetite, nausea and vomiting, ...Weakness, frequent urination and kidney problems also may occur.

Too much vit d: Yes there are side effects from too much vitamin d, which would be at a toxic level. The test would be at 100 or more to indicate toxicity. However most people do not get enough vit d., and are not toxic.