Taking Too Much Vitamin D Can Backfire, Scientists Warn

 https://www.sciencealert.com/taking-too-much-vitamin-d-can-backfire-scientists-warn

The "sunshine vitamin" may come with a dark side. Just as a lack of vitamin D can lead to health dangers, so too can an excess.

For years now, scientists have warned that not everyone needs to take vitamin D supplements, and that, in rare cases, high-dose versions can be toxic, especially for young kids and older adults.

Too much vitamin D raises calcium absorption, which can lead to hypercalcemia, where calcium forms dangerous deposits in arteries or soft tissues. This can raise the risk of kidney stones, disrupt bone metabolism, and bring on a whole host of nasty symptoms, including nausea, vomiting, constipation, fatigue, muscle weakness, or bone pain.