Vitamins are substances that your body needs to grow and develop normally. Vitamin A plays a role in your
- Bone growth
- Cell functions
- Immune system
Vitamin A is an antioxidant. It can come from plant or animal sources. Plant sources include colorful fruits and vegetables. Animal sources include liver and whole milk. Vitamin A is also added to foods like cereals.
Vegetarians, young children, and alcoholics may need extra Vitamin A. You might also need more if you have certain conditions, such as liver diseases, cystic fibrosis, and Crohn's disease. Check with your health care provider to see if you need to take vitamin A supplements.
NIH: National Institutes of Health Office of Dietary Supplements
- Facts about Vitamin A (University of Florida, Institute of Food and Agricultural Sciences) - PDF
- Vitamin A (National Institutes of Health, Office of Dietary Supplements) Also in Spanish
- Vitamin A (Harvard School of Public Health)
- Vitamin A and Bone Health (National Institute of Arthritis and Musculoskeletal and Skin Diseases)
- Vitamin A Test (American Association for Clinical Chemistry)
- ClinicalTrials.gov: Vitamin A (National Institutes of Health)
Journal Articles References and abstracts from MEDLINE/PubMed (National Library of Medicine)
- Article: Relative contribution of α-carotene to postprandial vitamin A concentrations in...
- Article: Effect of maternal antenatal and newborn supplementation with vitamin A...
- Article: Circulating concentrations of biomarkers and metabolites related to vitamin status,...
- Vitamin A -- see more articles