Vitamin D: What are the risks of toxicity? What is the solubility of your vitamin choice? How can the level of the vitamin that you chose be measured in the body?

For the vitamin you chose, suppose that it is likely to reach toxic levels in the body from excessive supplementation and then answer the following questions: What are the risks of toxicity? What is the solubility of your vitamin choice? How can the level of the vitamin that you chose be measured in the body? The vitamin I choose is Vitamin D. Please include references.