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  2. Vitamin B-12 - Mayo Clinic

    www.mayoclinic.org/drugs-supplements-vitamin-b12/art-20363663

    Left untreated, a vitamin B-12 deficiency can lead to anemia, fatigue, muscle weakness, intestinal problems, nerve damage and mood disturbances. 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.

  3. Can Vitamin B-12 Cause Side Effects? - Healthline

    www.healthline.com/health/food-nutrition/vitamin-b12-side-effects

    Learn about the possible side effects of taking too much vitamin B-12 supplements, such as nausea, headache, and blood clots. Find out how to avoid or treat these symptoms and when to see...

  4. Vitamin B12 Side Effects: Common, Severe, Long Term - Drugs.com

    www.drugs.com/sfx/vitamin-b12-side-effects.html

    Learn about the possible side effects of cyanocobalamin, the active ingredient in Vitamin B12, such as allergic reactions, gastrointestinal problems, and cardiovascular issues. Find out how to report side effects to the FDA and get professional information.

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

    www.webmd.com/vitamins/ai/ingredientmono-926/vitamin-b

    Learn about vitamin B12, an essential vitamin found in foods such as meat, fish, and dairy. Find out how it can treat and prevent deficiency, cyanide poisoning, and other conditions, and what are...

  6. Vitamin B12: What Are the Health Benefits?

    www.healthline.com/health/vitamin-b12

    Learn why vitamin B12 is essential for your health, how to get it from food or supplements, and what happens if you are deficient. Find out the symptoms, causes, and treatments of low B12...

  7. How Much Vitamin B12 Is Too Much? - Healthline

    www.healthline.com/nutrition/too-much-vitamin-b12

    Vitamin B12 is essential for health, but supplementing with high doses may cause side effects such as acne, kidney damage, and autism risk. Learn how much B12 you need, where to get...

  8. Vitamin B-12 Tablet - Uses, Side Effects, and More - WebMD

    www.webmd.com/drugs/2/drug-828/vitamin-b-12-oral/details

    Tell your doctor right away if any of these serious side effects occur: muscle cramps, weakness, irregular heartbeat. A very serious allergic reaction to this drug is rare.

  9. Vitamin B-12 (Cobalamin) for Fatigue, Memory Loss, Weakness - ...

    www.webmd.com/a-to-z-guides/supplement-guide-vitamin-b12

    Low vitamin B-12 can cause fatigue, weakness, memory loss, and other problems with the nervous system. WebMD explains how and when to take a B-12 supplement.

  10. Vitamin B-12: Benefits, foods, deficiency, and supplements

    www.medicalnewstoday.com/articles/219822

    Learn about the functions, sources, and symptoms of vitamin B12, a water-soluble vitamin essential for nerve, brain, and blood health. Find out who is at risk of deficiency and how to treat it...

  11. Learn about the benefits, dosage, and side effects of vitamin B12, a water-soluble vitamin that plays a role in neurological function and DNA synthesis. Find out how vitamin B12 may help with fatigue, neuropathy, pregnancy, and viral infections, and what are the potential drawbacks and interactions.