In the UK, the NHS (National Health Service) recommends a daily vitamin D supplement of 10 micrograms (400 IU). In a previous discussion on Hacker News a few da

In the UK, the NHS (National Health Service) recommends a daily vitamin D supplement of 10 micrograms (400 IU). In a previous discussion on Hacker News a few days ago, some posters mentioned this was a low and outdate dosage. However, the NHS site also warns against taking more than 100 micrograms (4000 IU) of vitamin D. In the previously mentioned HN discussion, some posters stated they take more than this (some have been told to by their doctors). What the NHS website says: Taking too many vitamin D supplements over a long period of time can cause too much calcium to build up in the body (hypercalcaemia). This can weaken the bones and damage the kidneys and the heart. If you choose to take vitamin D supplements, 10 micrograms a day will be enough for most people. Do not take more than 100 micrograms of vitamin D a day as it could be harmful. [1] https://news.ycombinator.com/item?id=23119949 https://news.ycombinator.com/item?id=23119949 [2] https://www.nhs.uk/conditions/vitamins-and-minerals/vitamin-d/ https://www.nhs.uk/conditions/vitamins-and-minerals/vitamin-...