| Not Yet Recruiting | THE B-BABIES STUDY: An Observational Study of Group B Vitamins in Preterm Infants NCT07163962 | Norfolk and Norwich University Hospitals NHS Foundation Trust | — |
| Completed | Oral Sucrosomial® Vitamin B12 in the Management of B12 Deficiency Among Metformin-Treated Type 2 Diabetes Pati NCT06983223 | Liaquat University of Medical & Health Sciences | N/A |
| Completed | Pre- and Post-Treatment Investigation of B12 and Folic Acid (Folate) Levels in Patients Receiving Antiepilepti NCT07013318 | Gaziosmanpasa Research and Education Hospital | — |
| Completed | Pre- and Post-Treatment Investigation of B12 and Folic Acid (Folate) Levels in Patients Receiving Antiepilepti NCT07013305 | Gaziosmanpasa Research and Education Hospital | — |
| Enrolling By Invitation | Challenges in Achieving Adequate Dietary Status of Women NCT06745817 | Institute of Nutrition, Slovenia (Nutris) | — |
| Not Yet Recruiting | Diet Quality of Pregnant Women With a Strict Plant-based Diet Versus an Omnivorous Diet NCT06046703 | Maastricht University Medical Center | — |
| Not Yet Recruiting | Vitamin B12 Status and Its Impact on Chronic Haemodialysis Patient NCT06441721 | Assiut University | — |
| Completed | Acceptability and Nutritional Impact of Double-fortified Salt Containing Iodine and Folic Acid NCT06223854 | University of California, Davis | N/A |
| Completed | Assessing the Efficacy of Different Carrier Systems in Oral Vitamin B12 Supplementation NCT06376591 | Liaquat University of Medical & Health Sciences | N/A |
| Unknown | Quadruple Fortified Salt Trial in India NCT03853304 | Cornell University | N/A |
| Completed | Effectiveness of Fortification With Folic Acid and Vitamin B12 Among Teenage Girls NCT06100146 | University Ghent | N/A |
| Active Not Recruiting | Vitamin B12 Dose Escalation Trial in Pregnancy NCT05426395 | George Washington University | Phase 1 |
| Completed | Effect of Household Use of Multiple Micronutrient-fortified Bouillon on Micronutrient Status Among Women and C NCT05178407 | University of California, Davis | N/A |
| Completed | Dried Purple Laver (Nori) as a Food Source of Vitamin B12 in Vegetarians NCT05614960 | Fu Jen Catholic University | N/A |
| Completed | Cobalamin Supply and Metabolism in Healthy Children From Birth to the Age of 12 Months and in Their Mothers (C NCT05315843 | University Children's Hospital, Zurich | — |
| Unknown | Dietary Challenges in the Population of Nursing Homes' Residents NCT05389618 | Institute of Nutrition, Slovenia (Nutris) | — |
| Recruiting | Early Infant Micronutrition and Development NCT05005897 | Sykehuset Innlandet HF | Phase 2 / Phase 3 |
| Completed | Nutritional Status and Bouillon Use in Northern Ghana NCT04632771 | University of California, Davis | — |
| Completed | ETOL-Elderly Study of the Efficiency of the Innovative Food Supplement in Elderly Adults NCT05661006 | Institute of Nutrition, Slovenia (Nutris) | N/A |
| Completed | Preoperative Anaemia prevaLence In surgiCal patiEnts NCT03978260 | Johann Wolfgang Goethe University Hospital | — |
| Unknown | Maternal B12 Supplementation to Improve Infant B12 Deficiency and Neurodevelopment NCT03783104 | University College, London | N/A |
| Completed | Effect of Daily Consumption of Vitamin B12 Fortified Yoghurt on Vitamin B12 Status in Older Adults NCT05993962 | University of British Columbia | N/A |
| Completed | A Comparison of Two Different Doses of Maternal B12 Supplementation in Improving Infant B12 Deficiency and Neu NCT04083560 | Sitaram Bhartia Institute of Science and Research | N/A |
| Completed | Effects of Vitamin B12 Treatment in Singers NCT03437824 | University of Southern California | EARLY_Phase 1 |
| Completed | Adults Nutrition as a Protective or Health-risk Factor NCT03284840 | Institute of Nutrition, Slovenia (Nutris) | — |
| Completed | Natural Versus Synthetic Vitamin B Complexes in Human NCT03444155 | Medical University of Graz | N/A |
| Active Not Recruiting | Vitamin B12 Supplementation During Pregnancy on Cognitive Development NCT03071666 | Centre For International Health | Phase 2 / Phase 3 |
| Completed | The Impact of Vitamin B12 Deficiency on Infant Gut Microbiota NCT03365583 | Marmara University | — |
| Completed | Cobalamin Deficiency - Diagnosis and Therapy NCT04243707 | University Hospital, Basel, Switzerland | — |
| Completed | Cracking the Egg Potential: Improving Young Child Nutrition in Ecuador NCT02446873 | Washington University School of Medicine | N/A |
| Completed | Oral/Intramuscular B12 to Treat Cobalamin Deficiency NCT01476007 | Gerencia de Atención Primaria, Madrid | N/A |
| Completed | Vitamin B12 Acceptance and Biomarker Response Study NCT01832129 | University Hospital, Basel, Switzerland | Phase 4 |
| Completed | Homocysteine After Laparoscopic Roux-enY Gastric Bypass NCT03489538 | Medical University of Vienna | — |
| Completed | Study of the Association of Muscle Strength, Balance and Other Factors With Vitamin Levels Among Elderly Diabe NCT03376490 | SingHealth Polyclinics | — |
| Completed | The Vitamin B Status in Type 2 Diabetes (VITA) Study NCT03447275 | Rima Obeid | — |
| Completed | Cobalamin Absorption From Fortified Food NCT01399164 | USDA, Western Human Nutrition Research Center | N/A |
| Completed | Efficacy and Safety Study of Oral Eligen® B12 in Subjects With Low Serum Cobalamin NCT01312831 | Emisphere Technologies, Inc. | N/A |
| Completed | COMPARATIVE EFFECTIVENESS OF MCI and DEMENTIA TREATMENTS IN A COMMUNITY-BASED DEMENTIA PRACTICE NCT02860338 | Clionsky Neuro Systems Inc. | — |
| Completed | Cobalamin Status in Young Children With Developmental Delay NCT00710138 | Haukeland University Hospital | N/A |
| Completed | Cobalamin Status in Young Children With Gastrointestinal Symptoms or Feeding Problems NCT00710359 | Haukeland University Hospital | N/A |
| Completed | Cobalamin Supplementation During Infancy; Effect on B-vitamin Status, Growth and Psychomotor Development NCT00479479 | Haukeland University Hospital | N/A |