headache after b12 injection I've had a migraine since Sept 4th. I took a that day (prescribed by my doctor) so I'm wondering if it's related or coincidence. I'm scared to take another one Why Do I Feel Worse
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Lucky, he didnt have PA, or his experience might have been quite different

Without a substantial change in UK medicines law or the development of a fully proven and licensed non-injectable alternative for malabsorption conditions like PA, the injection will remain a Prescription-Only Medicine

Essential metabolic can be impaired as a result of decreased mitochondrial activity brought on by low NAD+ levels