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  1. Usher Syndrome Type II - GeneReviews® - NCBI Bookshelf 
    https://www.ncbi.nlm.nih.gov/books/NBK1341
    ... A, Weigel-DiFranco C, Rosner B, Berson EL. Safety of <7500 RE (<25000 IU) vitamin A daily in adults with retinitis pigmentosa. Am J ...
  2. Nonsyndromic Retinitis Pigmentosa Overview - GeneReviews® - NCBI Bookshelf 
    https://www.ncbi.nlm.nih.gov/books/NBK1417
    ... A, Weigel-DiFranco C, Rosner B, Berson EL. Safety of <7500 RE (<25000 IU) vitamin A daily in adults with retinitis pigmentosa. Am J ...
  3. NLM Digital Collections - Inotersen and patisiran for hereditary transthyretin amyloidosis : effectiveness and value : .... 
    Publication: [Boston, Massachusetts] : Institute for Clinical and Economic Review, October 4, 2018
    resource.nlm.nih.gov/101745015
    ... and APOLLO trials required patients to take daily vitamin A supplements. Long-term safety is also a key uncertainty. As novel therapies ...
  4. Usher Syndrome Type I - GeneReviews® - NCBI Bookshelf 
    https://www.ncbi.nlm.nih.gov/books/NBK1265
    ... A, Weigel-DiFranco C, Rosner B, Berson EL. Safety of <7500 RE (<25000 IU) vitamin A daily in adults with retinitis pigmentosa. Am J ...
  5. NLM Digital Collections - The Response to the Pandemic by the United States, April 18-20, 1988 
    https://resource.nlm.nih.gov/101083016X13
    ... and measles; investigations of the health benefits of vitamin A supplementation; evaluation of the safety and efficacy of contraceptives; field studies of ivemectin ...
  6. NLM Digital Collections - Presidential Commission on the HIV Epidemic, hearing on Response to the Pandemic by the ... 
    Publication: Produced: 19 April 1988
    resource.nlm.nih.gov/101763264X120
    ... and measles; investigations of the health benefits of vitamin A supplementation; evaluation of the safety and efficacy of contraceptives; field studies of ivemectin ...
  7. NLM Digital Collections - AIDS Tracer M, 2/8/1988-3/31/1988 
    https://resource.nlm.nih.gov/101637321X54
    ... selenium. Beta carotene can be ged with complete safety as the source of vitamin A. In the case of selenium, she dangers of ...
  8. Vision - night blindness 
    https://medlineplus.gov/ency/article/003039.htm
    ... Treatable causes: Cataracts Nearsightedness Use of certain medicines Vitamin A deficiency (rare) Nontreatable causes: Birth defects, particularly congenital stationary night blindness Retinitis pigmentosa
  9. NLM Digital Collections - The nutrition front : report of the New York State Joint Legislative Committee on Nutrition 
    Publication: [Albany, NY] : New York State Joint Legislative Committee on Nutrition, 1943
    resource.nlm.nih.gov/13931110R
    ... FOOD ESSENTIALS NEEDED FOR ADEQUATE NUTRITION CALCIUM IRON VITAMIN A VITAMIN B" VITAMIN C” VITAMIN D*~ VITAMIN G (RIBOFLAVIN) SAFETY ZONE DANGER ZONE Workers getting adequate amounts Workers ...
  10. NLM Digital Collections - Subcommittee on Medical Nutrition - reports 
    https://resource.nlm.nih.gov/101085500X318
    ... to prevent beri-beri with no margin of safety; the amount of vitamin A (3000 I.U. daily) is barely adequate for ...
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