Quotes from the article are in italics.
Pills containing up to 2,250 times the recommended dose of the “sunshine vitamin” are putting people at risk of heart and kidney problems, according to the NHS lab, which said it sees two to three overdose cases every week.
That kind of information is not very useful alone. It would be good to put it into context. For example, I wonder how many paracetamol overdoses they deal with every week, either deliberate or unintentional?
But taking too much of the vitamin can cause the body to absorb dangerously high levels of calcium, leading to other serious health problems including high blood pressure and nausea.
We see lots of people coming here who tell us that, because they have been diagnosed with osteopenia or osteoporosis, they have been prescribed vitamin D and calcium. I wonder how many cases of excessive calcium are caused by doctors prescribing both vitamin D and calcium, when just vitamin D was needed.
And another point... Doctors never tell patients to take vitamin K2 or magnesium because they have no idea that they are needed. Excessive calcium in the blood could mean that there is a shortage of K2 and/or magnesium. My calcium levels used to be very high in range although I didn't supplement calcium. When I started taking K2 and magnesium my calcium level dropped.
Oh, and another quibble... I've seen research papers in which postmenopausal women were dosed with a single dose of 150,000 iU vitamin D every three months :
And any volunteers for a single dose of 600,000 iU vitamin D?
So, if such ridiculous research is done and apparently gets funding then doctors can hardly blame patients when they get it wrong.