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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 How Long Does It Take for B12 Shots to Work Fast? Can Vitamin B12 Shots Help You Lose Weight? Science & Myths Explained Vitamin B Deficiency: Symptoms, Causes and Vaccine Teddington
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