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No testing documentation: "Trust us, it's pure" isn't good enough

Some providers also offer oral or transdermal formulations, though absorption rates may differ

But this does not mean that all the B12 contained in the tablet will be absorbed, as it also depends on how much intrinsic factor is available for its absorption

Retrieved September 30, 2025, from link Sanz-Cuesta, T., Escortell-Mayor, E., Cura-Gonzlez, I., Martn-Fernndez, J., Riesgo-Fuertes, R., Garrido-Elustondo, S., OB12 Study Group

Symptoms of B12 deficiency include fatigue, weakness, constipation, loss of appetite, and nerve problems such as numbness and tingling in the hands and feet