Iron, Vitamin A and Vitamin B12: study protocols
16 study groups took Iron together with Vitamin A and Vitamin B12. These are the doses the studies gave. They are not a recommendation.
Dose per serving from research: Iron
16 study groups in 13 studies say how much Iron participants took a day.
These are the doses the studies gave. They are not a recommendation.
Most common: 25 mg to 50 mg, 56% of 16 study groups.
| Daily dose | Study groups |
|---|---|
| 5 mg to 10 mg | 5 |
| 10 mg to 25 mg | 2 |
| 25 mg to 50 mg | 9 |
Dose per serving from research: Vitamin A
11 study groups in 9 studies say how much Vitamin A participants took a day.
These are the doses the studies gave. They are not a recommendation.
Most common: 500 mcg to 1 mg, 64% of 11 study groups.
| Daily dose | Study groups |
|---|---|
| 100 mcg to 250 mcg | 1 |
| 250 mcg to 500 mcg | 2 |
| 500 mcg to 1 mg | 7 |
| over 1 mg | 1 |
Dose per serving from research: Vitamin B12
15 study groups in 12 studies say how much Vitamin B12 participants took a day.
These are the doses the studies gave. They are not a recommendation.
Most common: 2.5 mcg to 5 mcg, 53% of 15 study groups.
| Daily dose | Study groups |
|---|---|
| 0.5 mcg or less | 1 |
| 0.5 mcg to 1 mcg | 3 |
| 1 mcg to 2.5 mcg | 1 |
| 2.5 mcg to 5 mcg | 8 |
| 5 mcg to 10 mcg | 0 |
| 10 mcg to 25 mcg | 0 |
| 25 mcg to 50 mcg | 0 |
| 50 mcg to 100 mcg | 0 |
| 100 mcg to 250 mcg | 0 |
| 250 mcg to 500 mcg | 0 |
| 500 mcg to 1 mg | 0 |
| 1 mg to 2.5 mg | 0 |
| 2.5 mg to 5 mg | 0 |
| 5 mg to 10 mg | 2 |
Commonly used together
16 of 16 study groups took Iron, Vitamin A and Vitamin B12 with something else. Shown: what 3 or more different studies gave. The 10 most common of 13.
What was given together, not what works together.
| Taken with | Study groups |
|---|---|
| Folic Acid | 13 |
| Zinc | 13 |
| Vitamin C | 12 |
| Vitamin E | 12 |
| Copper | 11 |
| Iodine | 11 |
| Vitamin B6 | 11 |
| Vitamin D | 11 |
| Niacin | 9 |
| Selenium | 9 |
16 study groups
| Study | |||||
|---|---|---|---|---|---|
| Equity in adherence to and effect of prenatal food and micronutrient supplementation on child mortality: results from the MINIMat randomized trial, Bangladesh 2014 · EMMS (early food invitation; multiple micronutrients) · Pregnant women in rural Bangladesh, enrolled before 14 weeks’ gestation | 30 mg | 800 mcg | 2.6 mcg | — | — |
| Equity in adherence to and effect of prenatal food and micronutrient supplementation on child mortality: results from the MINIMat randomized trial, Bangladesh 2014 · UMMS (usual food invitation; multiple micronutrients) · Pregnant women in rural Bangladesh, enrolled before 14 weeks’ gestation | 30 mg | 800 mcg | 2.6 mcg | — | — |
| Modifying effects of maternal Hb concentration on infant birth weight in women receiving prenatal iron-containing supplements: a randomised controlled trial 2016 · MMN group · Pregnant women aged at least 20 years, nulliparous, with Hb concentration ≥100 g/L and enrolled before 20 weeks of gestation | 30 mg | 800 mcg | 2.6 mcg | — | — |
| Effect of micronutrient supplementation on diarrhoeal disease among stunted children in rural South Africa 2009 · multiple micronutrients · children aged 6–24 months; three cohorts: HIV-infected children, HIV-uninfected children born to HIV-infected mothers, and HIV-uninfected children born to HIV-uninfected mothers | 10 mg | 1,250 IU | 0.9 mcg | 548 days | — |
| Predictors of adherence to micronutrient supplementation before and during pregnancy in Vietnam 2017 · MM (multiple micronutrients) preconception group · Women of reproductive age in Vietnam intending to become pregnant | 8.57 mg | 114 mcg | 0.371 mcg | 54 weeks | 1,469 |
| Assessing the adherence and acceptability to iron and folic acid compared with multiple micronutrient supplements during pregnancy: a cluster-randomized noninferiority trial in Cambodia 2025 · MMS-180 · Healthy pregnant individuals aged 18–45 years, in the first 14 weeks of a low-risk singleton pregnancy | 30 mg | 800 mcg | 2.6 mcg | 180 days | 516 |
| Assessing the adherence and acceptability to iron and folic acid compared with multiple micronutrient supplements during pregnancy: a cluster-randomized noninferiority trial in Cambodia 2025 · MMS-90 · Healthy pregnant individuals aged 18–45 years, in the first 14 weeks of a low-risk singleton pregnancy | 30 mg | 800 mcg | 2.6 mcg | 180 days | 515 |
| Associations of maternal nutrition during pregnancy and post-partum with maternal cognition and caregiving 2018 · MMN · Pregnant women enrolled at ≤20 weeks’ gestation in Malawi, followed through 6 months postpartum | 20 mg | — | 5.2 mg | 1 year | 239 |
| Associations of maternal nutrition during pregnancy and post-partum with maternal cognition and caregiving 2018 · LNS · Pregnant women enrolled at ≤20 weeks’ gestation in Malawi, followed through 6 months postpartum | 20 mg | — | 5.2 mg | 1 year | 234 |
| Effect on longitudinal growth and anemia of zinc or multiple micronutrients added to vitamin A: a randomized controlled trial in children aged 6-24 months 2010 · Multiple micronutrients · Children enrolled at 6 months and followed to 24 months in rural South Africa; HIV-infected and HIV-uninfected children, both sexes | 10 mg | 1,250 IU | 0.9 mcg | 548 days | 126 |