Some years ago I got interested in vitamin D (not actually a vitamin!) and for the past 3 or 4 my wife and I have been taking 5000 iu a day. Given that the recommended supplement dosage is in the order of 600 iu a day (sometimes less) I have sometimes wondered if that is a little excessive, however my research reassured me that very high doses well in excess of this can be tolerated without risk.
It appears I was wrong!
A research paper published a few days ago would suggest that the recommended daily intake of vitamin D has been underestimated by a factor of 10 and that I could even double my daily 5000 iu to 10000 iu safely:
This will probably be all over the popular health sites and media over the next few weeks.
Interesting times, and if true underlines the value of diligent research when the WWW is at your fingertips!