>D3 by itself can cause high calcium levels

I developed a calcification in my arm due to this. My wrist was in pain and I couldn't bend it. Got an x-ray, and boom: what looked like a little ball of bone had appeared.

Stopped taking D3 immediately and my body reabsorbed it, never had it again.

Funny enough, it happened when I was visiting Paris. Got to use Google Translate to explore the French medical system :)