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The Weird Connection Between B12 Deficiency & Migraine Headaches Headache After B12 Shot: Why It Happens & What to Do 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 Can a B12 Deficiency Make You Feel Like You're Dying? Botox for Migraines: How It Works, Side Effects & Injection Sites
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