b12 injection insulin syringe BD Ultra-Fine U-100 Syringe, 30G x 12.7mm, 100/bx self injecting vitamin b12 B12

Well-documented cases exist, but the term is often applied to whatever a nonspecific precipitation step removes, and some studies use methods that cannot actually confirm what was present

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Individuals with a history of severe allergic reactions to injectable vitamins should be monitored closely or offered alternatives per clinician judgment

Other common reasons are a local injection-site reaction, your body adjusting to corrected levels, and an underlying deficiency that was more severe than expected