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The muscle acts as a reservoir, releasing B12 gradually into the bloodstream over hours to days
Regular B12 supplementation is necessary to maintain optimal levels and prevent deficiency from occurring again
If you suspect you might have a B12 deficiency, the best place to start is with a medical evaluation
in such settings the risk benefit ratio should be reassessed, and preservative-free preparations considered
In such cases, its vital to go back to your GP
In vitro studies confirm minimal cytotoxicity with no impact on cell viability up to 100 M concentrations across multiple cell types, though higher concentrations may produce non-specific effects that could confound experimental results
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