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B12 deficiency isn't necessarily marked by any one symptom in particular
Better mental clarity and focus
The good news is that effective, proven options for what you're actually feeling absolutely are
Anti-Doping Agency (USADA) Wada-Ama Low risk because natural gastric derivative (fallacy: synthetic product with limited human PK and impurity concerns)
It is intended strictly for laboratory research use only
Add fecal calprotectin if gut health is your goal, and P1NP if you're tracking tissue repair
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