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 »

Vitamin B12 is available for purchase online through B12-Shot.com in the form of a topical, an injectable, a needle application or as drops. As of August 2015, prices range from roughly $10 for ten shots to about $70 for... More »

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Vitamin B12 shots are designed for people who have a deficiency in vitamin B12. According to Dr. Roy Benaroch on KevinMD.com, anemia, poor diet, depression, neuropathy and irritability are all causes of a deficiency in v... More »

www.reference.com Health Medications & Vitamins Vitamins & Supplements

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

Side effects of vitamin B-12 injections include an overall feeling of puffiness, fatigue, itching, rash, hives, and muscle weakness, cramps or pain, states MedlinePlus. Reactions limited to specific body parts include le... 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