Vitamin D3 dosage a little low, I think to prevent idiots from overdosing. Vitamin D toxicity definitely messes with calcium metabolism
It does affect calcium metabolism. That’s why I look for a D3 supplement which contains vitamin K. Vitamin K helps with getting the calcium to the right places in the body. Vitamin K is found in green vegetables like Spinach. Too much vitamin K can cause the blood to coagulate too well.