The challenge is that Vitamin D is the new egg debate. i.e. eggs are good for you, eggs are bad for you. Many Vitamin D studies like this one talk about major

The challenge is that Vitamin D is the new egg debate. i.e. eggs are good for you, eggs are bad for you. Many Vitamin D studies like this one talk about major events (i.e. things associated with sudden death), less so about the symptoms of cardiovascular health. Other studies talking about cancer will say similar that higher Vitamin D is found in certain cancers or the opposite effect in other cancers. Definition of a controversial topic.