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If you arent completely confident in your ability or feel worried, a safe choice may be to schedule an appointment to have it administered by a physician in their clinic, or to have your B12 shot administered at a pharmacy
Keep vials clean during preparation to reduce contamination risks
Availability is generally consistent, and supply chain disruptions are less common than with pharmaceutical-grade compounds
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
PMID 23539619.
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