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