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Best B12 Shots in Chicago & Naperville 2026 Why did I feel worse after a methylcobalamin B12 shot? Vitamin B12 Side Effects Hi all. I'm slowly easing back into social media after my latest B12 injection left me feeling unwell for 5 days. It was so good to be out for an energising nature Has anyone with pernicious anemia received a letter about B12 injection replacement?
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