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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 leg pain, headache, thirst, swelling of the limbs and red face.


A Vitamin B-12 injection is used to treat a variety of conditions that result from a deficiency of vitamin B-12, according to MedlinePlus. An injection can be used proactively to counteract the deficiency of vitamin B-12 due to various illnesses, infections or medications.


People take vitamin B12 injections due to their inability to absorb the essential nutrient from foods or dietary supplements. An estimated 1.5 to 15 percent of Americans suffer from vitamin B12 deficiency, reports the United States' National Institutes of Health.


Injections of cyanocobalamin, or vitamin B12, normally get administered daily to start. They are then given every other day for two to three weeks, and then monthly to treat pernicious anemia, according to Drugs.com. Adults with pernicious anemia usually take vitamin B12 injections for life. Dosages


Vitamin B-12 side effects are rare when taken in correct doses, but high doses may cause acne, states WebMD. Severe allergic reactions to the main ingredient in vitamin B-12 supplements, cyanocobalamin, can cause chest tightening, breathing problems, hives and swelling of the face, tongue, mouth and


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 used with no significant reactions. There are no tolerable upper intake levels in p


Injectable vitamin B12 can be purchased without a prescription from several online sources, including ushcgshots.com, b12-shot.com and aminopharmaceuticals.com. These websites ship within the United States and offer both needles and syringes. Injectable vitamin B12 is only available for purchase fro


To self-administer a B12 injection, sterilize the area, either the upper thigh or top of the buttocks, and then quickly push the full length of the needle through the skin, explains Phoenix Diabetes and Endocrinology. Pull the plunger slightly back, and check the syringe for blood. Then, depress the


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 worse, contact the doctor or pharmacist immediately. An injection of vitamin B12 m


Despite claims to the contrary, there is no clear evidence that injections of vitamin B-12 can assist with weight loss, according to Mayo Clinic. Some weight-loss clinics offer the injections, claiming they can raise energy and metabolism levels and therefore help people burn calories faster.