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Common B12 Injection Side Effects Physicians may prescribe vitamin B12 injections, also known as cobalamin or cyanocobalamin injections, to patients suffering from vitamin B12 anemia, fatigue, or other symptoms of vitamin B12 deficiency
Side effects are rare but may include skin irritation or, with excessive use, potential copper accumulation
However, some professional sports organizations test for certain compounds
pubmed-bpc157-systematic-review-2025 WADA Prohibited List: S0 Non-Approved Substances S0 Non-Approved Substances prohibits at all times any pharmacological substance with no current governmental approval for human therapeutic use, explicitly naming BPC-157 among examples
