In Nov 2010 the Institute of Medicine voted that 20 nanograms of vitamin D was enough for BONE health
With the following graph you can see that to protect against bone failure that about 72 nmols is needed
NOT the 50 nmols that the IOM voted for.
hashed lines and red were added by VitaminDWiki
CLICK HERE for details from Nature Magazine - July 2011
By the way - the IOM apparently did not look at any data after mid-2008,
so they missed out on an avalanche of new information: more than the bone benefits from Vitamin D
CLICK HERE for a summary of proof of vitamin D benefits
generally from Random Controlled Trials with Vitamin D intervention
Vitamin D Recommendations from around the world: both IU and nanograms, which has the following
The MINIMUM recommendation by 25 experts was HIGHER than the Institute of Medicine
A notional graph - which provides an overview of lots of vitamin D reports