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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. pdfNLM Technical Bulletin, July-August 1996 
    https://www.nlm.nih.gov/...m_technical_bulletin_july_august_1996.pdf
    ... RM In vivo biosynthesis of retinoic acid from beta-carotene involves and excentric cleavage pathway in ferret intestine [ ... acid can be produced by excentric cleavage of beta-carotene in vivo. By using an inhibitor of retinaldehyde ...
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