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  1. Mayo Clinic
    https://www.mayoclinic.org/drugs-supplements-vitamin-b12/art-20363663

    Vitamin B-12 - Mayo Clinic

    • Vitamin B-12 (cobalamin) plays an essential role in red blood cell formation, cell metabolism, nerve function and the production of DNA, the molecules inside cells that carry genetic information. Food sources of vitami… 展开

    What The Research Says

    Research on the use of vitamin B-12 for specific activities and conditions shows: 1. Heart and … 展开

    Mayo Clinic
    Our Take

    Generally safe
    Most people get enough vitamin B-12 from a balanced diet. However, older adults, vegetarians, vegans and people who have conditions that af… 展开

    Mayo Clinic
    Safety and Side Effects

    When taken at appropriate doses, vitamin B-12 supplements are generally considered safe. While the recommended daily amount of vitamin B-12 for adults is 2.4 micrograms, hig… 展开

    Mayo Clinic
    Interactions

    Possible interactions include: 1. Aminosalicylic acid (Paser).Taking this drug used to treat digestive problems might reduce your body's ability to absorb vitamin B-12. 2. Colchici… 展开

    Mayo Clinic
    Health Benefits of Vitamin B12, Based on Science
    Vitamin B12 supplements may benefit your body and overall health in different ways, from helping your eyes and mind to benefiting your bones, hair, and skin.
    Healthline · https://www.healthline.com/nutritio…
    反馈
    目录
    What The Research Says
    Our Take
    Safety and Side Effects
    Interactions
     
  1. 2.4 micrograms
    • 根据 3 个来源
    When taken at appropriate doses, vitamin B-12 supplements are generally considered safe. While the recommended daily amount of vitamin B-12 for adults is 2.4 micrograms, higher doses have been found to be safe.

    Vitamin B-12 - Mayo Clinic

    mayoclinic.org
    The recommended daily intake of vitamin B-12 for adults is 2.4 micrograms.

    Vitamin B12: Health Benefit…

    webmd.com
    For most adults, the recommended dietary allowance (RDA) is 2.4 micrograms (mcg), though it’s higher for people who are pregnant or nursing. Vitamin B12 supplements may benefit your body and overall health in different ways, from helping your eyes and mind to benefiting your bones, hair, and skin.

    Health Benefits of Vitami…

    healthline.com
  2. 其他用户还问了以下问题
    How much vitamin B12 is in a supplement?
    The amount of vitamin B12 in supplements varies widely. Some provide doses of vitamin B12 that are much higher than recommended amounts, such as 500 mcg or 1,000 mcg, but your body absorbs only a small percentage of it. These doses are considered safe. Check the Supplement Facts label to see how much vitamin B12 a supplement contains.

    Vitamin B12 - Consumer - Office of Dietary Supplements - Vitamin B12

    ods.od.nih.gov
    How much vitamin B-12 should I take a day?
    The recommended daily amount of vitamin B-12 for adults is 2.4 micrograms (mcg). Most people can get enough vitamin B-12 in the foods they eat. But people who follow a vegetarian or vegan diet should eat nutritional yeast and other foods fortified with vitamin B-12. Or they can take a low-dose multivitamin that includes 2.4 mcg of vitamin B-12.

    Vitamin B-12 - Mayo Clinic

    mayoclinic.org
    What are the health benefits of vitamin B12 supplements?
    Vitamin B12 supplements may benefit your body and overall health in different ways, from helping your eyes and mind to benefiting your bones, hair, and skin. Here are some possible health benefits of vitamin B12, all based on science. 1. Helps with red blood cell formation and anemia prevention

    Health Benefits of Vitamin B12, Based on Science

    healthline.com
    Is vitamin B12 a multivitamin?
    Vitamin B12 is available in multivitamin/mineral supplements, in B-complex supplements, and in supplements containing only vitamin B12. It is usually in a form called cyanocobalamin. Other common forms are adenosylcobalamin, methylcobalamin, and hydroxycobalamin.

    Vitamin B12 - Consumer - Office of Dietary Supplements - Vitamin B12

    ods.od.nih.gov
    What is a Daily Value (DV) for vitamin B12?
    *DV = Daily Value. FDA developed DVs to help consumers compare the nutrient contents of foods and dietary supplements within the context of a total diet. The DV for vitamin B12 is 2.4 mcg for adults and children age 4 years and older . FDA does not require food labels to list vitamin B12 content unless vitamin B12 has been added to the food.

    Vitamin B12 - Health Professional Fact Sheet

    ods.od.nih.gov
    Is vitamin B12 a supplemental vitamin?
    Vitamin B12 is also available in a form that’s dissolved under your tongue (called sublingual vitamin B12). Research has not shown that any form of supplemental vitamin B12 is better than the others. The amount of vitamin B12 in supplements varies widely.

    Vitamin B12 - Consumer - Office of Dietary Supplements - Vitamin B12

    ods.od.nih.gov
    反馈
  3. Healthline
    https://www.healthline.com/nutrition/vitamin-b12-dosage

    Vitamin B12 Dosage: How Much Should You Take per Day?

  4. Office of Dietary Supplements (ODS)
    https://ods.od.nih.gov/factsheets/VitaminB12-Consumer

    Vitamin B12 - Consumer - Office of Dietary Supplements (ODS)

  6. 查看 Vitamin B12 Supplements Daily

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      VEGETOLOGY Vegan Vitamin B12 Sublingual Energy Supplements - Metabolism Vitamins & Health Supplements - Daily Supplements (60 Vitamin Tablets)
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      DEVA Vegan Vitamin B12 Fast Dissolve Supplement - Once-Per-Day Complex With 1000 Mcg Methylcobalamin B12, Folic Acid, B6 - Lemon Flavor - 90 Dissolva
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  7. Office of Dietary Supplements (ODS)
    https://ods.od.nih.gov/factsheets/Vitaminb12-HealthProfessional

    Vitamin B12 - Health Professional Fact Sheet

  8. Office of Dietary Supplements (ODS)
    https://ods.od.nih.gov/pdf/factsheets/VitaminB12-Consumer.pdf
    [PDF]

    Vitamin B12 Fact Sheet for Consumers - Office of Dietary …

  10. Healthline
    https://www.healthline.com/nutrition/vit…

    Health Benefits of Vitamin B12, Based on Science

    2024年1月30日 · Vitamin B12 supplements may benefit your body and overall health in different ways, from helping your eyes and mind to benefiting your bones, hair, and skin.

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  11. Harvard Health
    https://www.health.harvard.edu/stayin…

    Should you take a vitamin B12 supplement? - Harvard …

    2022年8月15日 · It’s a good idea for older adults to take a B12 supplement of 2.8 micrograms daily to ward off B12 deficiency. People who have very low levels of B12 may need to take a much higher dose or get B12 injections.

  12. WebMD
    https://www.webmd.com/vitamins/ai/ingredientmono-926/vitamin-b

    VITAMIN B12 - Uses, Side Effects, and More - WebMD

  13. harvard.edu
    https://nutritionsource.hsph.harvard.edu/…

    Vitamin B12 - The Nutrition Source

    Vitamin B12, or cobalamin, is naturally found in animal foods. It can also be added to foods or supplements. Vitamin B12 is needed to form red blood cells and DNA. It is also a key player in the function and development of brain and …

  14. Verywell Health
    https://www.verywellhealth.com/benefits …

    Benefits of Vitamin B12 and How to Get Enough of It

    2024年5月31日 · Vitamin B12 supplements can help treat or prevent a deficiency in people who are at greater risk. Supplementation is also often marketed to help prevent several conditions, such as heart disease, macular …