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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


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.


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


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.


According to the National Institutes of Health Office of Dietary Supplements, vitamin B12 is responsible for keeping blood cells and nerve tissue healthy, preventing a specific kind of anemia called megaloblastic anemia, and forming DNA. Insufficient B12 in a person's diet leads to pernicious anemia


According to the National Institutes of Health, vitamin B12 helps the body maintain healthy nerves and blood cells and helps in the production of DNA. It also helps prevent a type of anemia called megaloblastic anemia that makes people tired and weak.


According to WebMD, the main benefits of vitamin B12 include helping the body maintain a healthy nervous system and creating new blood cells. Newsmax notes that other benefits of vitamin B12 include maintaining a healthy digestive system and keeping hair and nails strong and healthy.