On Dec 5, 2010
Searched PubMed with "Vitamin D" in title/abstract and found
141 Meta-Analysis = overview of many Random Controlled Trials
4784 Reviews
998 Random Controlled Trials
1668 Clinical Trials
38 Practice Guidelines
More PubMed articles every year with vitamin D in title or abstract
year ending 2010 - 2429; ending 2009 - 1783; ending 2008 - 1541
whereas, "vitamin A" was mentioned only 2389 times in the past 5 years
Searched US Clinical Trials database for Vitamin D
720 clinical trials
421 clinical trials updated since Jan 1, 2010
CLICK HERE to see just how much vitamin D is being considered in recent Clinical Trials
Clinical trials previously typically used doses of less than 2000 IU - which does not give much benefit
Searched WHO International Clinical Trials Database for Vitamin D
1247 clinical trials (includes US
239 clinical trials with interventions (typically supplementing with vitamin D3)
Clinical Trials for Vitamin D - Jan 2011