Stuck in one arm but had to switch due to a tightening and stinging feeling. Now that arms injection area is a bit swollen and sore to move. Normal or should I What Happens When You're Allergic to Vitamin B12 Why does my arm hurt after a shot? Managing Post Injection Pain After a Week B12 Injections for Energy: Benefits and How It Works AZ IV Medics
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sore arm after b12 injection Will a Vitamin B12 Injection Give Me More Energy?