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Some compounds are identified through breakdown products that persist well beyond the parent molecule, and some testing regimes do not look for the compound at all but for biomarker patterns it produces
Common side effects include injection site reactions (burning, pain, swelling, redness), headache, mild diarrhea, and upset stomach
PMID 6769048
Why Are B12 Injections Needed Instead of Tablets
While most side effects are mild and manageable , patients should be aware of the rare but serious risks
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