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NCBI Bookshelf
How long B12 shots take to work depends on your B12 levels when you receive the injection, but you can expect to see improved energy, mental clarity, sleep, and other benefits anywhere from 12-48 hours after treatment
Side effects are rare but may include mild redness or swelling at the injection site
PMID 19153403
Unlike regular pharmacies that sell pre-manufactured drugs, compounding pharmacies can put prescribed drugs into custom topical treatments, injectables, flavored liquids, and more at specified doses
doi: 10.1016/j.chom.2009.05.018 153 BergelsonJMCoyneCB
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