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Description
B12 cannot be synthesized by the human body
Acta Neuropsychiatrica

Those who produce less stomach acid, such as people over 50 or individuals taking acid-reducing medications, may not absorb B12 from food efficiently

High-dose protocols require thorough medical evaluation and ongoing monitoring

So this guide sticks to what the lab and animal studies actually looked at, and treats all of it as research context - not as anything the vial will do for a person
