Vitamin C and Vitamin A: study protocols
8 study groups took Vitamin C together with Vitamin A. These are the doses the studies gave. They are not a recommendation.
Dose per serving from research: Vitamin C
8 study groups in 7 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, 63% of 8 study groups.
| Daily dose | Study groups |
|---|---|
| 25 mg to 50 mg | 5 |
| 50 mg to 100 mg | 1 |
| 100 mg to 250 mg | 0 |
| 250 mg to 500 mg | 1 |
| 500 mg to 1 g | 0 |
| 1 g to 2.5 g | 1 |
Dose per serving from research: Vitamin A
7 study groups in 6 studies say how much Vitamin A participants took a day.
These are the doses the studies gave. They are not a recommendation.
Most common: 250 mcg to 500 mcg, 57% of 7 study groups.
| Daily dose | Study groups |
|---|---|
| 100 mcg to 250 mcg | 1 |
| 250 mcg to 500 mcg | 4 |
| 500 mcg to 1 mg | 1 |
| 1 mg to 2.5 mg | 0 |
| 2.5 mg to 5 mg | 0 |
| 5 mg to 10 mg | 0 |
| 10 mg to 25 mg | 0 |
| over 25 mg | 1 |
Commonly used together
8 of 8 study groups took Vitamin C and Vitamin A with something else. Shown: what 3 or more different studies gave.
What was given together, not what works together.
| Taken with | Study groups |
|---|---|
| Zinc | 7 |
| Iron | 5 |
| Vitamin E | 4 |
| Folic Acid | 3 |
8 study groups
| Study | ||||
|---|---|---|---|---|
| Impact of iron fortification on anaemia and iron deficiency among pre-school children living in Rural Ghana 2021 · non-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 | 400 mcg | 150 days | 991 |
| 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 | 400 mcg | 150 days | 967 |
| Megadose vitamins in bladder cancer: a double-blind clinical trial 1994 · megadose vitamins arm · Patients with biopsy-confirmed transitional cell carcinoma of the bladder receiving BCG immunotherapy | 2 g | — | — | 35 |
| 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 | 1 mg | — | — |
| Supplementation with multivitamins and vitamin A and incidence of malaria among HIV-infected Tanzanian women 2014 · multivitamins with vitamin A · HIV-infected pregnant women in Tanzania | 500 mg | 30 mg | 1249 days | — |
| 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 | 156 mcg | 1 year | 316 |
| 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 | 300 mcg | 13 weeks | — |
| 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 | 400 mcg | 60 days | 254 |