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What Are the Side Effects of Vitamin B12?

April 26, 2017B12 vitamin

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What Are the Side Effects of Vitamin B12?

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Vitamin B12 is a water soluble vitamin. There are no apparent side effects of vitamin B12 when it is taken orally in recommended doses. When it is received intramuscularly by means of injection, such as in a cyanocobalamin injection, or sublingually, through the tissues beneath the tongue, doses are often much higher and side effects may occur. These are very rare and range from minor problems, such as headache and mild digestive issues, to more serious side effects, such as breathing difficulties and heart problems.