Safe when administered under professional supervision, with minimal side effects
If side effects do occur, they are generally mild and may include: Pain, discomfort, swelling, or redness at the injection site Diarrhea Headache Bloating Nausea Numbness or tingling Serious side effects are rare and may include: Confusion Dizziness or fainting Muscle pain, cramps, or weakness Extreme thirst Facial flushing Frequent urination Palpitations Fatigue Difficulty breathing Coughing or noisy breathing (wheezing) Extreme pain, swelling, warmth or tenderness in one leg Difficulty swallowing Rash Itching over the body If you experience serious side effects, contact your doctor right away
Cyanocobalamin needs to be changed into active forms, while methylcobalamin is ready to use right away
B12 injections fit into this approach because they may help reduce one of the biggest barriers to adherence: feeling drained
For a deeper dive, our blog covers related topics in more detail
Use a new sterile needle and syringe for each injection