Taking too much vitamin D won't lead to liver toxicity, but can have other dangerous health effects.

If you feel confused, are falling down more, and feel excessively thirsty, you may be taking too much vitamin D.

The body can get vitamin D naturally from sunlight and foods like liver, but most people are deficient due to spending time indoors (and the fact that liver isn't a fan-favorite food), said Dr. Zhaoping Li, the director of the University of California, Los Angeles' Center for Human Nutrition.