extreme fatigue after b12 injection Feeling worse after B12 Injection: Answering concerns What You Need to Know

It plays an important role in DNA and red blood cell production

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The most common adverse events are gastrointestinal: nausea (occurring in 12-33% of subjects depending on dose), diarrhea, constipation, and decreased appetite

These injections are safer and less likely to cause tissue damage, making them a reliable choice for extended treatment plans

Subcutaneous injections are also very effective, but just a bit slower entering the bloodstream than intravenous and intramuscular

While there's no official upper limit, doses up to 2,000 mcg can be safely used to treat B12 deficiency under medical supervision