b12 vitamin vs injection Best Sites B12 Shots vs. IV Infusions:
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Test Spot Requirement SC: Initial 2.5mg test dose, monitor for 30 minutes for any reactions before full dose

For example, a 2019 study of over 9,000 adults found people with obesity had lower blood levels of vitamin B12 (8)

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SQ delivery may help, because fat tissue has fewer blood vessels than muscle, leading to slower dispersion of B12

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