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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 Vitamin B12 Benefits and Best Sources Hydroxocobalamin (Vitamin B12): Uses, Alternatives, Side Effects & More GoodRx How Quickly Does a B12 Shot Work? Benefits & What to Expect Why do I feel worse after a B12 injection? CoLaz
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