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The Weird Connection Between B12 Deficiency & Migraine Headaches Vitamin B12 Side Effects: Risks of Excess Intake How Long Do The Side Effects Of B12 Injections Last Why do I feel so bad after a B12 injection? I've had a migraine since Sept 4th. I took a B12 injection that day (prescribed by my doctor) so I'm wondering if it's related or coincidence. I'm scared to take another one
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