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In Situ SIMS Analysis and Reactions of Surfaces Prepared by Soft Landing of Mass-Selected Cations and Anions Using an Ion Trap Mass Spectrometer
It's the professional standard for a reason

And for most people dealing with B12 deficiency, that is honestly all they need

Avoid taking it with food, supplements, or medications that can interfere with absorption, such as calcium or iron supplements, antacids, or certain medications like proton pump inhibitors