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Serious side effects of Vitamin B12. Along with its needed effects, cyanocobalamin (the active ingredient contained in Vitamin B12) may cause some unwanted effects. Although not all of these side effects may occur, if they do occur they may need medical attention.
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.
Taking too much can cause side effects like nausea, headache, dizziness, and in rarely, blood clots or cancer. Everyone needs vitamin B-12, and most people get enough through their diet....
Learn more about VITAMIN B12 uses, effectiveness, possible side effects, interactions, dosage, user ratings and products that contain VITAMIN B12.
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.
Vitamin B12 side effects. Get emergency medical help if you have signs of an allergic reaction: hives; difficulty breathing; swelling of your face, lips, tongue, or throat. Vitamin B12 may cause serious side effects. Call your doctor at once if you have: heart problems--swelling, rapid weight gain, feeling short of breath;
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.