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The main side effects of a vitamin B12 injection include redness at the injection site, mild diarrhea, itching or a feeling of swelling all over the body, according to MedicineNet. If these side effects persist or get wo... More »

www.reference.com Health Medications & Vitamins Side Effects

Some side effects of vitamin B12 include clumsiness, dizziness, anxiety, a reduced sense of touch and weakness, according to Drugs.com. People can also suffer from itching and rash and a worsening of inflammatory acne. O... More »

www.reference.com Health Medications & Vitamins Side Effects

The benefits of vitamin B-12 include its support of the central nervous system, the skin, hair, liver and eyes, according to the University of Maryland Medical Center. However, high levels of vitamin B-12 can imbalance t... More »

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Some side effects of vitamin B12 include clumsiness, dizziness, anxiety, a reduced sense of touch and weakness, according to Drugs.com. People can also suffer from itching and rash and a worsening of inflammatory acne. O... More »

www.reference.com Health Medications & Vitamins Side Effects

There are no known side effects associated with high intake levels of vitamin B12, states the Linus Pauling Institute at Oregon State University. Doses 1,000 times higher than the recommended dietary amount have been use... More »

www.reference.com Health Medications & Vitamins Side Effects

Common side effects of flu shots are soreness, redness and swelling at the shot site, according to MedicineNet. Fevers and aches are possible but less common. These side effects typically last no longer than two days. More »

www.reference.com Health Medications & Vitamins Side Effects

Medical professionals consider vitamin B-12 to be non-toxic, but a small number of people who are allergic to the vitamin or some other component of a dietary supplement may experience numbness or tingling in the extremi... More »

www.reference.com Health Medications & Vitamins Side Effects