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  1. Dietary Reference Intakes - Vitamin, Mineral, and Multivitamin Supplements for the Primary Prevention of Cardiovascular ... 
    https://www.ncbi.nlm.nih.gov/books/NBK173992
    ... recommended dietary allowance; UL = upper intake level. Note: Beta-carotene does not have a dietary reference intake. Copyright Notice Bookshelf ID: NBK173992 Contents < Prev ...
  2. Vitamin A 
    https://medlineplus.gov/ency/article/002400.htm
    ... to normal once you reduce your intake of beta-carotene.
  3. Hypervitaminosis A 
    https://medlineplus.gov/ency/article/000350.htm
    ... one source. Some people take vitamin A and beta carotene supplements in the belief it will help prevent cancer. This may lead to chronic hypervitaminosis A if people take more than is recommended.
  4. Workgroup Exercise - Issues and Challenges in Conducting Systematic Reviews to Support Development of Nutrient ... 
    https://www.ncbi.nlm.nih.gov/books/NBK44080
    ... Evidence Map for Key Questions on Vitamin A Reference Values The aim of the ... beta-carotene and the risk of morbidity and mortality, xerophthalmia, ...
  5. Lung Cancer Prevention (PDQ®) - PDQ Cancer Information Summaries - NCBI Bookshelf 
    https://www.ncbi.nlm.nih.gov/books/NBK66017
    ... Associated With an Increased Risk of Lung Cancer Beta-carotene supplementation in current smokers Based on solid evidence, ... That Do Not Decrease Risk of Lung Cancer Beta-carotene in nonsmokers Based on solid evidence, nonsmokers who ...
  6. NLM Digital Collections - The Surgeon General's Report on Nutrition and Health (Index) 
    Publication: United States. Public Health Service. Office of the Surgeon General, 1988
    resource.nlm.nih.gov/101584932X726
    ... background, 511-12 Benzodiazepines, 682 Beta blockers, 679 Beta-carotene, ... for, 11~12 Reference standards, 279-81! Bone physiology, 314-15 Breast ...
  7. NLM Digital Collections - The Surgeon General's Report on Nutrition and Health 
    Publication: United States. Public Health Service. Office of the Surgeon General, 1988
    resource.nlm.nih.gov/101584932X695
    ... background, 511-12 Benzodiazepines, 682 Beta blockers, 679 Beta-carotene, ... for, 11~12 Reference standards, 279-81! Bone physiology, 314-15 Breast ...
  8. NLM Digital Collections - Military preventive medicine 
    Publication: Harrisburg, Pa. : Military Service Publishing Company, 1940
    resource.nlm.nih.gov/14311080R
    ... growth promoting quality of 0.0006 milligrams of beta-carotene. The ... U.S.P. reference cod liver oil which contains 3000 International units, ...
  9. Skin Cancer Prevention (PDQ®) - PDQ Cancer Information Summaries - NCBI Bookshelf 
    https://www.ncbi.nlm.nih.gov/books/NBK66059
    ... of the controlled-trial environment.[ 18 ] Chemopreventive agents Beta carotene In the Physicians’ Health Study, 21,884 male ... to take 50 mg doses of daily oral beta carotene versus placebo in a 2 × 2 factorial trial ...
  10. Stomach (Gastric) Cancer Prevention (PDQ®) - PDQ Cancer Information Summaries - NCBI Bookshelf 
    https://www.ncbi.nlm.nih.gov/books/NBK65822
    ... been calculated and indicate possible protective effects of beta carotene, vitamin A, vitamin E, selenium, vitamin C, or ... the gastric cancer mortality rate after supplementation with beta carotene, vitamin E, and selenium.[ 24 ] The population studied, ...
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