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Vitamin A Deficiency clinical trials

The registry lists 67 studies for Vitamin A Deficiency across more than 10 countries. 7 are recruiting or about to start. 50 of them are mainly about Vitamin A Deficiency (how this is decided). Per ClinicalTrials.gov, last updated 2026-10-26.

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Status

Completed
50
Status unknown
7
Recruiting
6
Active, not recruiting
3
Not yet recruiting
1

Phase

Phase 3
10
Phase 2
8
Early Phase 1
2

Where

United States
16
Bangladesh
7
China
4
Ghana
3
Ethiopia
3
Zambia
3

Who runs them

USDA, Western Human Nutrition Research Center (5) · Johns Hopkins Bloomberg School of Public Health (5) · University of California, Davis (4) · University of Wisconsin, Madison (3) · Swiss Federal Institute of Technology (3) · Wageningen University (3) · Purdue University (3) · Newcastle University (2)

What is being tested here

Drugs under test in Vitamin A Deficiency studies, those with the most open studies first. Medicines only given beside them are not counted. How drugs are counted

DrugOpenPhase 3All
Vitamin A2310
Phentolamine122
Retinol palmitate002
Beta Carotene001
Vitamin E001

Coming up

1phase 3 study under way
4studies finish main data collection within a year1 of them phase 3

Studies recruiting or running, from their records. “Main data collection” ends at the primary completion date, the sponsor’s own estimate, which often moves.

All 4, phase 3 first

Who these studies take

Of the 6 Vitamin A Deficiency studies recruiting now, 3 (50%) set no upper age limit and 3 (50%) stop at 75 or younger. 2 (33%) take children under 18. 0 (0%) are for women only and 0 (0%) for men only; 2 (33%) take healthy volunteers.

Recruiting studies that take each age, of 6
AgeWomenMen
102 (33%)2 (33%)
184 (67%)4 (67%)
304 (67%)4 (67%)
404 (67%)4 (67%)
504 (67%)4 (67%)
653 (50%)3 (50%)
753 (50%)3 (50%)
853 (50%)3 (50%)

Across all 67 studies, recruiting or not: 73% stop at 75 or younger and 73% at 65; 60% take children; 25% are for women only and 0% for men only; 73% take healthy volunteers. From each study’s registry entry; the criteria on its page decide.

How long Vitamin A Deficiency studies take

Of 19 interventional studies with no phase under Vitamin A Deficiency, half reached primary completion within 15 months of starting, counting those still running.

Start to primary completionEvery sponsorIndustryNon-industry
Interventional, no phase15 mo7–26 · 19 studies——

Each figure is the month by which half the studies had reached primary completion, with the range in which the middle half did. Studies still running count until their last registry update; studies that stopped early are left out. Phase 1 includes early phase 1; observational means prospective or not stated, as retrospective and cross-sectional studies date a window of data rather than a study. How these figures are worked out

Studies

Recruiting first, then most recently updated. Showing 50 of 67. Browse all 67 → or search them.