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Choose 2mL if you have extensive experience with precision dosing and prefer minimal injection volumes
For researchers and clinicians, this means making decisions based on incomplete information
The published research on oral B12 bioavailability consistently shows around 1% absorption meaning of a 1000mcg oral dose, only about 10mcg actually reaches your cells
the majority of research relies on animal models or in vitro experiments, and the translatability of their findings to humans requires further validation
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