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Full pearl, with the evidence table and references (Parente 2018, Clin Infect Dis): Save this for your boards

It is studied in laboratory environments for its biochemical properties and peptide signaling behavior

Cognitive Function: Adequate B12 levels are linked to improved memory and reduced risk of cognitive decline

We simply dont know enough to make such bold statements

A more evidence-based way to evaluate whether something is helping is to track measurable outcomes with your clinician (for example, symptoms tied to confirmed deficiency, or objective metrics like body weight, waist measurements, and lab work when appropriate)