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Why do I feel worse after a B12 injection? CoLaz does b12 injection cause headache b12 injection triggers migraine Can Vaccines Cause Headaches or Migraine? Vitamin B12 Injection Side Effects and Safety B12 Shots Side Effects And How To Treat Them 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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