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is b12 an intramuscular injection Vitamin Sites: All You Need to Know B12 Shots vs. IV Infusions:
Description
There might be a little bruise for a day or so
2005;6(13):R108

However, its effectiveness can vary, and more research is needed to fully understand its long-term impacts
Rare Side Effects: Although rare, some individuals may experience allergic reactions or other adverse effects
