Supplement Forms/Alternate Names

  • Retinol


Vitamin A is found in apples, dairy, and greens. Vitamin A helps the body fight off illness and improve vision. It has been used to help fight off infections in infants and to help the body fight off viruses like HIV and measles. It is used in people who lack vitamin A. Vitamin A can be taken as a pill. It can also be applied to the skin and injected into muscle by a healthcare provider.


No more than 10,000 international units (IU) per day.

What Research Shows

Likely Effective

  • Age-related cataracts—likely to lower the risk B1
  • HIV infection in children—likely to lower mortality and improve short-term growth F1, F2
  • Oral leukoplakia—likely to heal oral sores L1

May Be Effective

  • Glaucoma —may provide benefit E1 Measles—may prevent measles mortality in children J1, J2

May Not Be Effective

  • Infant support—may not provide benefit I1-I6
  • Miscarriage—may not prevent K1

Unlikely to Be Effective

  • Fracture risk—unlikely to lower the risk of fracture D1, D2
  • Pregnancy support —unlikely to provide benefit N1-N3
  • Retinopathy of prematurity—unlikely to provide benefit P1

Not Enough Data to Assess

Editorial process and description of evidence categories can be found at EBSCO NAT Editorial Process.

Editorial process and description of evidence categories can be found at EBSCO NAT Editorial Process.

Safety Notes

It is likely safe to take vitamin A in small doses for a short time. It may not be safe to take large doses for a long period.

  • People who are sensitive to vitamin A products should talk to their doctors first.
  • Women who are pregnant or breastfeeding should talk to their doctors before taking Vitamin A. It is not safe to take large amounts during pregnancy.


Talk to your doctor about any supplements or therapy you would like to use. Some can interfere with treatment or make conditions worse, such as:


REFA Acute Diarrhea and Gastroenteritis in Children

REFA1 Florez ID, Veroniki AA, et al. Comparative effectiveness and safety of interventions for acute diarrhea and gastroenteritis in children: A systematic review and network meta-analysis. PLoS One. 2018 Dec 5;13(12):e0207701.

REFB Age-Related Cataract

REFB1 Wang A, Han J, et al. Association of vitamin A and β-carotene with risk for age-related cataract: a meta-analysis. Nutrition. 2014 Oct;30(10):1113-1121.

REFC All-Cause Mortality

REFC1 Bjelakovic G, Nikolova D, et al. Antioxidant supplements for prevention of mortality in healthy participants and patients with various diseases. Cochrane Database Syst Rev. 2012 Mar 14;(3):CD007176.

REFC2 Bjelakovic G, Nikolova D, et al. Meta-regression analyses, meta-analyses, and trial sequential analyses of the effects of supplementation with beta-carotene, vitamin A, and vitamin E singly or in different combinations on all-cause mortality: do we have evidence for lack of harm? PLoS One. 2013 Sep 6;8(9):e74558.

REFD Fracture Risk

REFD1 Wu AM, Huang CQ, et al. The relationship between vitamin A and risk of fracture: meta-analysis of prospective studies. J Bone Miner Res. 2014 Sep;29(9):2032-2039.

REFD2 Zhang X, Zhang R, et al. The Effect of Vitamin A on Fracture Risk: A Meta-Analysis of Cohort Studies. Int J Environ Res Public Health. 2017 Sep 10;14(9). pii: E1043.

REFE Glaucoma

REFE1 Ramdas WD, Schouten JSAG, et al. The Effect of Vitamins on Glaucoma: A Systematic Review and Meta-Analysis. Nutrients. 2018 Mar 16;10(3). pii: E359.

REFF HIV Infection in Children

REFF1 Humphreys EH, Smith NA, et al. Prevention of diarrhoea in children with HIV infection or exposure to maternal HIV infection. Cochrane Database Syst Rev. 2010 Jun 16;(6):CD008563.

REFF2 Irlam JH, Siegfried N, et al. Micronutrient supplementation for children with HIV infection. Cochrane Database Syst Rev. 2013 Oct 11;(10):CD010666.

REFG HIV Support

REFG1 Wiysonge CS, Ndze VN, et al. Vitamin A supplements for reducing mother-to-child HIV transmission. Cochrane Database Syst Rev. 2017;9:CD003648.

REFH Pregnancy Support in Women with HIV Infection

REFH1 Siegfried N, Irlam JH, et al. Micronutrient supplementation in pregnant women with HIV infection. Cochrane Database Syst Rev. 2012 Mar 14;(3):CD009755.

Infant Support

REFI1 Imdad A, Yakoob MY, et al. Impact of vitamin A supplementation on infant and childhood mortality. BMC Public Health. 2011 Apr 13;11 Suppl 3:S20.

REFI2 Mayo-Wilson E, Imdad A, et al. Vitamin A supplements for preventing mortality, illness, and blindness in children aged under 5: systematic review and meta-analysis. BMJ. 2011 Aug 25;343:d5094.

REFI3 Gogia S, Sachdev HS. Vitamin A supplementation for the prevention of morbidity and mortality in infants six months of age or less. Cochrane Database Syst Rev. 2011 Oct 5;(10):CD007480.

REFI4 Darlow BA, Graham PJ, et al. Vitamin A supplementation to prevent mortality and short-and long-term morbidity in very low birth weight infants. Cochrane Database Syst Rev. 2016;(8):CD0000501

REFI5 Imdad A, Mayo-Wilson E, et al. Vitamin A supplementation for preventing morbidity and mortality in children from six months to five years of age. Cochrane Database Syst Rev. 2022 Mar 16;3(3):CD008524.

REFI6 Haider BA, Sharma R, et al. Neonatal vitamin A supplementation for the prevention of mortality and morbidity in term neonates in low and middle income countries. Cochrane Database Syst Rev. 2017;2:CD006980.

REFJ Measles

REFJ1 Sudfeld CR, Navar AM, et al. Effectiveness of measles vaccination and vitamin A treatment. Int J Epidemiol. 2010 Apr;39 Suppl 1:i48-55.

REFJ2 D’souza RM, D’souza R. Vitamin A for treating measles in children. Cochrane Database Syst Rev. 2002;(1):CD001479.

REFK Miscarriage

REFK1 Balogun OO, da Silva Lopes K, et al. Vitamin supplementation for preventing miscarriage. Cochrane Database Syst Rev. 2016 May 6;(5):CD004073.

REFL Oral Leukoplakia

REFL1 Lodi G, Franchini R, et al. Interventions for treating oral leukoplakia to prevent oral cancer. Cochrane Database Syst Rev. 2016 Jul 29;7:CD001829.

REFM Postpartum Support

REFM1 Oliveira JM, Allert R, et al. Vitamin A supplementation for postpartum women. Cochrane Database Syst Rev. 2016 Mar 25;3:CD005944.

REFN Pregnancy Support

REFN1 Thorne-Lyman AL, Fawzi WW. Vitamin A and carotenoids during pregnancy and maternal, neonatal and infant health outcomes: a systematic review and meta-analysis. Paediatr Perinat Epidemiol. 2012 Jul;26 Suppl 1:36-54.

REFN2 McCauley ME, van den Broek N, et al. Vitamin A supplementation during pregnancy for maternal and newborn outcomes. Cochrane Database Syst Rev. 2015 Oct 27;(10):CD008666.

REFN3 Cruz S, da Cruz SP, et al. Impact of Vitamin A Supplementation on Pregnant Women and on Women Who Have Just Given Birth: A Systematic Review. J Am Coll Nutr. 2018 Mar-Apr;37(3):243-250.

REFO Retinitis Pigmentosa

REFO1 Rayapudi S, Schwartz SG, et al. Vitamin A and fish oil for retinitis pigmentosa. Cochrane Database Syst Rev. 2013;(12):CD008428.

REFP Retinopathy of Prematurity

REFP1 Fang JL, Sorita A, et al. Interventions To Prevent Retinopathy of Prematurity: A Meta-analysis. Pediatrics. 2016 Apr;137(4). pii: e20153387.

Revision Information

  • Reviewer: EBSCO NAT Review Board Eric Hurwitz, DC
  • Review Date: 07/2019
  • Update Date: 03/26/2020