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Why do I feel worse after a B12 injection? CoLaz 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 B12 Injection Services Subtly You Common & Rare Side Effects of Vitamin B12 Injections B12 Headache: The Link Between Vitamin B12 and Headaches
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