Researchers are looking at adults and Vitamin D and are now saying a growing number of adults in the U.S. say they are taking too much.
They say 3% of adults are supplementing at doses that can be linked to serious side effects, some of them include:kidney stones, cancer, and even death.
Vitamin D helps with calcium absorption and maintaining phosphate levels in the blood, so it is generally a good thing.
But too much Vitamin D can damage soft tissues, including kidneys and the heart.
Experts say if you're young and otherwise healthy, and you get enough sun exposure, you probably get enough Vitamin D.