vitamins

2018 Tarot Card Reading. accurate fortune teller. Free ..

Vitamin A

Vitamins

Vitamin A

  • Found in animal foods and converted from beta-carotene in plant foods.
  • Required for vision, gene expression, reproduction, embryonic development, red blood cell production, and immune function.
  • Prescription vitamin A derivatives are used to treat skin conditions (acne) and retinitis pigmentosa (genetic eye disease).
  • Deficiency is rare in Canada, but common in developing countries due to malnutrition. It causes night blindness, dry eyes and skin, and impaired growth.
  • Drugs that deplete vitamin A: cholestyramine, colestipol, mineral oil, and neomycin.
  • Supplements should be avoided by those at risk of lung cancer (smokers) or liver toxicity (alcoholics, liver disease).
  • Doses greater than 10,000 IU daily should be avoided by pregnant women due to the risk of birth defects. Most prenatal vitamins provide 5,000 IU.
  • Doses greater than 5,000 IU may increase risk of osteoporosis.
  • Supplements of vitamin A beyond what is provided in a multivitamin are not recommended due to risk of toxicity. To avoid this risk, choose a multivitamin that contains beta-carotene, which is converted to vitamin A in the liver, but is not associated with health risks.

  • Food Sources : Liver, dairy products, and oily fi sh (Beta-carotene is found in orange and green vegetables and fruit)
  • Adequate Intake : (mcg/day)
    Men = 900
    Women = 700
    Pregnancy = 770
    Lactation = 1,300
  • Upper Limit : (mcg/day)
    Men = 3,000
    Women = 3,000
    Pregnancy = 3,000
    Lactation = 3,000
    Note: 1 mcg = 3.33 IU
  • Side Effects : Liver toxicity and birth defects (associated with vitamin A, not beta-carotene)


  • Vitamin E
    Vitamin C Ascorbic Acid
    Folate Folic Acid
    Vitamin B3 Niacin
    Biotin
    Vitamin A
    Vitamin B1 Thiamine
    Vitamin B5 Pantothenic Acid
    Vitamin D
    Vitamin B12 Cobalamin
    Vitamin B2 Ribofl avin
    Vitamin B6 Pyridoxine
    More ...

    Test your English Language
    New Years Eve Cake Ideas
    Movie Plot Holes and Paradoxes
    Amazingly Unique Walks Around The World
    Places you cant Visit
    Swimming Tips for Beginners
    New Mehandi Designs
    Healthy foods that can make you Fat
    Avataars of Lord Shiva
    Avataars of Lord Vishnu
    Awesome Gifts For Christmas