Possible B12 injection side effects tend to be mild and short-lived, and may include: Injection site pain, redness, or swelling Mild itching Brief diarrhea (less common) A feeling of warmth after the injection Serious side effects are rare
Management should focus on eliminating repeated exposure and reducing inflammation, often with topical or oral steroids when appropriate. A dermatologist can prescribe those medications
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Reducing application frequency or concentration can minimize irritation for sensitive individuals
The Basics: Vitamin B12 in Brief What is vitamin B12
However, there are important considerations when using both treatments concurrently