Clinic, C
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
There are no significant restrictions, but you should avoid vigorously massaging the injection site for a few hours
Comparing Oral, Sublingual, and Injectable Efficacy Vitamin B12 comes in oral, sublingual, and injectable forms
This allows the body to consolidate gains and reduces any theoretical long-term risks from extended continuous use