An 89-year-old retired businessman died from an “overdose” of Vitamin D supplements that did not warn about the risks of excessive intake.
David Mitchener from Oxted, Surrey, reportedly had fatally high levels of Vitamin D when he was brought to the East Surrey Hospital last year in May and was suffering from hypercalcaemia – a build-up of calcium in the body associated with taking too much vitamin D.
He died ten days later.
Most people in the developed world are vitamin D deficient though. And it's even worse for melanated people as they live further from the equator. 30 minutes of sun exposure in the summer will give you over 10,000 iu of Vitamin D so that's a good daily number to shoot for with supplements if it's winter or you're stuck indoors. Vitamin D and fish oil are the only supplements I take as all of the other essential nutrients are easily obtained with food.