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high b12 levels after injections in Blood: What It Really Means · PA Relief Can a B12 (cobalamin) injection
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As a wife, mom, and yoga enthusiast, Jackie now empowers others who feel like their bodies are working against them to reclaim their strength, confidence, and vitality
Unknown long-term profile: No human safety data, so caution and monitoring are advised

It is thought that a small percentage of cyanocobalamin degrades to hydroxocobalamin during storage

If there are visible symptoms eg red, inflamed, swollen etc might be worth taking a photo which you could send to GP if needed
