Vitamin C and Iron: study protocols
13 study groups took Vitamin C together with Iron. These are the doses the studies gave. They are not a recommendation.
Dose per serving from research: Vitamin C
13 study groups in 10 studies say how much Vitamin C participants took a day.
These are the doses the studies gave. They are not a recommendation.
Most common: 25 mg to 50 mg, 38% of 13 study groups.
| Daily dose | Study groups |
|---|---|
| 5 mg or less | 1 |
| 5 mg to 10 mg | 2 |
| 10 mg to 25 mg | 2 |
| 25 mg to 50 mg | 5 |
| 50 mg to 100 mg | 2 |
| 100 mg to 250 mg | 1 |
Dose per serving from research: Iron
12 study groups in 9 studies say how much Iron participants took a day.
These are the doses the studies gave. They are not a recommendation.
Most common: 5 mg to 10 mg, 33% of 12 study groups.
| Daily dose | Study groups |
|---|---|
| 2.5 mg to 5 mg | 2 |
| 5 mg to 10 mg | 4 |
| 10 mg to 25 mg | 3 |
| 25 mg to 50 mg | 2 |
| over 50 mg | 1 |
Commonly used together
12 of 13 study groups took Vitamin C and Iron with something else. Shown: what 3 or more different studies gave.
What was given together, not what works together.
| Taken with | Study groups |
|---|---|
| Vitamin A | 10 |
| Folic Acid | 8 |
| Zinc | 7 |
13 study groups
| Study | ||||
|---|---|---|---|---|
| Impact of iron fortification on anaemia and iron deficiency among pre-school children living in Rural Ghana 2021 · iron-MNP group · Children aged 6–35 months living in rural Ghana; children with severe anaemia, severe malnutrition, recent iron supplementation, or chronic disease were excluded. | 30 mg | 12.5 mg | 150 days | 967 |
| Effects of maternal micronutrient supplementation on fetal loss and infant mortality: a cluster-randomized trial in Nepal 2003 · Multiple micronutrients · Pregnant women in rural Nepal | 100 mg | — | — | — |
| Micronutrient fortified milk improves iron status, anemia and growth among children 1-4 years: a double masked, randomized, controlled trial 2010 · Micronutrient-fortified milk (MN group) · Children aged 1–4 years in India; many had anemia, iron deficiency, or growth faltering | 40.2 mg | 9.6 mg | 1 year | 316 |
| Vitamin C-Rich Guava Consumed with Mungbean Dal Reduces Anemia and Increases Hemoglobin but not Iron Stores: A Randomized Controlled Trial of Food-to-Food Fortification in Indian Children 2024 · mungbean dal with fresh guava · Children aged 6–10 years in rural Haryana, India; the group included children with and without anemia or iron deficiency | 170 mg | 3.2 mg | 213 days | — |
| The effect of Lactiplantibacillus plantarum 299v together with a low dose of iron on iron status in healthy pregnant women: A randomized clinical trial 2021 · Lp group · Healthy, non-anemic pregnant women aged 18–42 years, with singleton pregnancies and iron-replete status at enrollment | 24 mg | 8.4 mg | — | 120 |
| Short-term daily or weekly administration of micronutrient Sprinkles has high compliance and does not cause iron overload in Chinese schoolchildren: a cluster-randomised trial 2006 · daily group · Children aged 3–6 years in a kindergarten in northern China | 50 mg | 30 mg | 13 weeks | — |
| Weekly micronutrient supplementation to build iron stores in female Indonesian adolescents 1997 · daily supplementation group · female Indonesian high-school adolescents | 60 mg | 60 mg | 90 days | — |
| Weekly micronutrient supplementation to build iron stores in female Indonesian adolescents 1997 · weekly supplementation group (60 mg Fe) · female Indonesian high-school adolescents | 8.57 mg | 8.57 mg | 90 days | — |
| Weekly micronutrient supplementation to build iron stores in female Indonesian adolescents 1997 · weekly supplementation group (120 mg Fe) · female Indonesian high-school adolescents | 8.57 mg | 17.1 mg | 90 days | — |
| Micronutrient Sprinkles reduce anemia among 9- to 24-mo-old children when delivered through an integrated health and nutrition program in rural Haiti 2007 · Sprinkles-WSB (S-WSB) · Children aged 9–24 months in rural Haiti receiving take-home fortified wheat-soy blend rations | 30 mg | 12.5 mg | 60 days | 254 |