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The good news is that headaches typically resolve on their own within one to two weeks
Seek immediate emergency care (call 999 or go to A&E) if you experience symptoms of a severe allergic reaction after a B12 injection, such as difficulty breathing, facial or throat swelling, widespread rash, or dizziness
Mild injection-site reactions (5-10%) and minor systemic effects like nausea (2-5%) are more common
Customer Reviews: "This B12 supplement has helped me feel more energetic and focused without the jitters
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