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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 How Long Do The Side Effects Of B12 Injections Last Why do I feel so bad after a B12 injection? Common & Rare Side Effects of Vitamin B12 Injections Why do I feel worse after a B12 injection? CoLaz 11 symptoms of vitamin B12 deficiency Vitamin B12 Injection Side Effects and Safety
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