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12 12 Why Do I Feel Worse After My B12 Injection? Understanding Post Injecti Oxford Origins Headache and Migraine Treatment Subtly You Vitamin B12: Symptoms, Dosage & Toxicity Risks 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
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