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All study protocols

Vitamin A: study protocols

95 study groups say how much Vitamin A participants took a day. These are the doses the studies gave. They are not a recommendation.

Vitamin A: what the research found →

Dose per serving from products

11,198 products in our catalogue print how much Vitamin A a serving holds.

Most common: 500 mcg to 1 mg, 30% of 11,198 products.

Dose per servingProducts
25 mcg or less
172
25 mcg to 50 mcg
468
50 mcg to 100 mcg
384
100 mcg to 250 mcg
975
250 mcg to 500 mcg
1,875
500 mcg to 1 mg
3,341
1 mg to 2.5 mg
2,459
2.5 mg to 5 mg
710
5 mg to 10 mg
584
over 10 mg
230

Dose per serving from research

58 study groups in 37 studies say how much Vitamin A participants took a day.

These are the doses the studies gave. They are not a recommendation.

Most common: 1,000 IU to 2,500 IU and 2,500 IU to 5,000 IU, 22% of 58 study groups each.

Daily doseStudy groups
500 IU or less
1
500 IU to 1,000 IU
3
1,000 IU to 2,500 IU
13
2,500 IU to 5,000 IU
13
5,000 IU to 10,000 IU
0
10,000 IU to 25,000 IU
11
25,000 IU to 50,000 IU
6
50,000 IU to 100,000 IU
0
100,000 IU to 250,000 IU
10
over 250,000 IU
1

Commonly used together

54 of 95 study groups took Vitamin A with something else. Shown: what 3 or more different studies gave. The 10 most common of 18.

What was given together, not what works together.

Taken withStudy groups
Iron
26
Zinc
25
Vitamin C
14
Folic Acid
13
Vitamin E
12
Beta-Carotene
9
Vitamin B12
7
Copper
6
Iodine
6
Vitamin B6
5

95 study groups

Study
Vitamin A and Zinc Supplementation Among Pregnant Women to Prevent Placental Malaria: A Randomized, Double-Blind, Placebo-Controlled Trial in Tanzania
2017 · vitamin A group · Pregnant women in their first trimester, primigravid or secundigravid, HIV-negative
2,500 IU—625
Effect of daily low dose of vitamin A compared with single high dose on morbidity and mortality of hospitalized mainly malnourished children in senegal: a randomized controlled clinical trial
2007 · daily low-dose VA supplement · Hospitalized Senegalese children, mainly malnourished and with infections and/or malnutrition
5,000 IU—610
Effect of daily low dose of vitamin A compared with single high dose on morbidity and mortality of hospitalized mainly malnourished children in senegal: a randomized controlled clinical trial
2007 · high-dose VA supplement · Hospitalized Senegalese children, mainly malnourished and with infections and/or malnutrition
200,000 IU—604
Mild vitamin A deficiency and risk of respiratory tract diseases and diarrhea in preschool and school children in northeastern Thailand
1990 · oral vitamin A · Children aged 1–5 years
200,000 IU1 day166
Oral vitamin A supplementation in very low birth weight neonates: a randomized controlled trial
2019 · vitamin A group · Very-low-birth-weight inborn infants requiring respiratory support at 24 hours of age
5,000 IU4 weeks98
All-trans retinoic acid plus high-dose dexamethasone as first-line treatment for patients with newly diagnosed immune thrombocytopenia: a multicentre, open-label, randomised, controlled, phase 2 trial
2021 · all-trans retinoic acid plus high-dose dexamethasone · Adults older than 18 years with treatment-naive, newly diagnosed primary immune thrombocytopenia and a platelet count below 30 × 10^9/L, or below 50 × 10^9/L with clinically significant bleeding
20 mg12 weeks66
Combined FOLFOX4 with all-trans retinoic acid versus FOLFOX4 with placebo in treatment of advanced hepatocellular carcinoma with extrahepatic metastasis: a randomized, double-blind comparative study
2023 · FOLFOX4-ATRA group · Adults with unresectable advanced hepatocellular carcinoma and extrahepatic metastasis; mostly men, mean age about 52 years
60 mg—53
Oral all-trans retinoic acid plus danazol versus danazol as second-line treatment in adults with primary immune thrombocytopenia: a multicentre, randomised, open-label, phase 2 trial
2017 · ATRA plus danazol group · Adults aged 18 years or older with primary immune thrombocytopenia, not splenectomised and corticosteroid-resistant or relapsed
20 mg16 weeks45
Double blind, cluster randomised trial of low dose supplementation with vitamin A or beta carotene on mortality related to pregnancy in Nepal. The NNIPS-2 Study Group
1999 · vitamin A · Married women of reproductive age in rural Nepal; some became pregnant during the study
1 mg1278 days—
A randomized trial of vitamin A supplements in relation to mortality among human immunodeficiency virus-infected and uninfected children in Tanzania
1999 · Vitamin A · Children aged 6 months to 5 years admitted to hospital with pneumonia; severely malnourished children and those with clinical signs of vitamin A deficiency were excluded
400,000 IU243 days—