Try the modernized ClinicalTrials.gov beta website. Learn more about the modernization effort.
Working…
ClinicalTrials.gov
ClinicalTrials.gov Menu
Open or close the search fields display
1212 Studies found for: Vitamin D AND vitamin D supplements

A similar map is available for all studies in ClinicalTrials.gov

Click on the map below to show a more detailed map (when available) or search for studies (when map not available).

Map Legend
Source:https://ClinicalTrials.gov
Region Name Number of Studies
World [map] 1,212
Middle East 82
Iran, Islamic Republic of 21 [studies]
Iraq 1 [studies]
Israel 24 [studies]
Jordan 8 [studies]
Lebanon 5 [studies]
Qatar 2 [studies]
Saudi Arabia 9 [studies]
Syrian Arab Republic 1 [studies]
Turkey 7 [studies]
United Arab Emirates 4 [studies]
Hints:

Click on a [map] link to show a map of that region.

Click on a [studies] link to search within your current results for studies in that region. Use the back button to return to this list and try another region.

Studies with no locations are not included in the counts or on the map.

Studies with multiple locations are included in each region containing locations.