In some cases, it can be injected subcutaneously (under the skin)
Common side effects of vitamin B12 injections include mild diarrhea, itching, nausea and vomiting, dizziness, headaches, and hot flashes
People taking heartburn medication, such as proton pump inhibitors, are at a higher risk for B12 deficiency and may benefit from alternative therapies to control/eliminate the heartburn or have regular Nutrient IV therapies and/or Vitamin B12 injections Elderly Vegans Vegetarians People with tapeworms Alcoholics Excessive use of antibiotics Excessive use of anti-convulsant medication Daily consumption of Aspirin may increase the risk for vitamin B12 deficiency
If you experience signs of an allergic reaction such as hives, difficulty breathing, or swelling of your face, lips, tongue, or throat, seek emergency medical attention immediately.