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Vitamin B 12 Deficiency clinical trials

The registry lists 73 studies for Vitamin B 12 Deficiency across more than 10 countries. 8 are recruiting or about to start. 43 of them are mainly about Vitamin B 12 Deficiency (how this is decided). Per ClinicalTrials.gov, last updated 2026-11-02.

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Status

Completed
56
Active, not recruiting
7
Not yet recruiting
4
Status unknown
2
Enrolling by invitation
2
Recruiting
2

Phase

Phase 4
5
Phase 2
4
Phase 3
2
Phase 1
1
Early Phase 1
1

Where

United States
10
India
6
Germany
4
United Kingdom
4
Norway
4
Slovenia
4

Who runs them

Haukeland University Hospital (3) · Nutrition Institute, Slovenia (3) · University of Aarhus (3) · University of California, Davis (3) · USDA, Western Human Nutrition Research Center (2) · Northwell Health (2) · Liaquat University of Medical & Health Sciences (2) · University of British Columbia (2)

What is being tested here

Drugs under test in Vitamin B 12 Deficiency studies, those with the most open studies first. Medicines only given beside them are not counted. How drugs are counted

DrugOpenPhase 3All
Vitamin B 121213
Hydroxocobalamin004
Mecobalamin003
Folic Acid002
Vitamin B 6001
Pyridoxine001
Levomefolate calcium001
B12001

Coming up

2phase 3 studies under way
2studies finish main data collection within a year

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 2

Who these studies take

Of the 2 Vitamin B 12 Deficiency studies recruiting now, 0 (0%) set no upper age limit and 2 (100%) stop at 75 or younger. 2 (100%) take children under 18. 0 (0%) are for women only and 0 (0%) for men only; 0 (0%) take healthy volunteers.

Recruiting studies that take each age, of 2
AgeWomenMen
100 (0%)0 (0%)
181 (50%)1 (50%)
301 (50%)1 (50%)
401 (50%)1 (50%)
500 (0%)0 (0%)
650 (0%)0 (0%)
750 (0%)0 (0%)
850 (0%)0 (0%)

Across all 73 studies, recruiting or not: 58% stop at 75 or younger and 45% at 65; 23% take children; 23% are for women only and 1% for men only; 52% take healthy volunteers. From each study’s registry entry; the criteria on its page decide.

How long Vitamin B 12 Deficiency studies take

Of 19 interventional studies with no phase under Vitamin B 12 Deficiency, half reached primary completion within 7 months of starting, counting those still running.

Start to primary completionEvery sponsorIndustryNon-industry
Interventional, no phase7 mo4–38 · 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 73. Browse all 73 → or search them.