vitamin b12 injections benefits and side effects are there any risks associated with Shots: B12 Benefits, Uses, of B12 Injection – B12 Injections - Forever Young

Because this formulation provides multiple B vitamins at significant doses, it is important to consider how each component might interact with medications or other supplements the patient is taking

(June 1988)

In rare situations, B12 shots itching rash anaphylaxis, a life threatening condition that can cause a fast heartbeat and difficulty breathing Other side effects that can occur include: shortness of breath, fast weight gain, and swelling congestive heart failure, the inability of the heart to adequately pump blood pulmonary edema, the buildup of fluid in the lungs peripheral vascular thrombosis, the obstruction of a vein with a blood clot hypokalemia, low potassium levels that can cause irregular heartbeats and muscle weakness fever tingling, numbness, and joint pain swollen tongue polycythemia, an increase in the red blood cell mass Additionally, B12 B12 shots are not necessary for weight loss

B12 injections are typically administered intramuscularlyusually in the upper arm or thigh

PMC 5788147