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How Quickly Does a B12 Shot Work? Benefits & What to Expect 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 Headaches and exhaustion after B12 Pernicious Anaemi Signs You May Have a B12 Deficiency B12 Injections
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