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However, some people do not get enough B-12 vitamins

Its essential to how your body functions

This laboratory-grade research material is supplied as a lyophilised powder and packaged in a sealed, tamper-evident research vial to support precise handling and accurate measurement during laboratory workflows

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That is intentional: the two vial sizes reflect two different documented protocols and two different concentration setups, and it is a reminder never to eyeball a dose across vial sizes