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So the honest answer is: it did things in rodents, and its effect on human memory is completely unknown

Bergknut N, Meij BP, Hagman R, de Nies KS, Rutges JP, Smolders LA, Creemers LB, Lagerstedt AS, Hazewinkel HA, Grinwis GC: Intervertebral disc disease in dogs - part 1: a new histological grading scheme for classification of intervertebral disc degeneration in dogs

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For observational studies reporting serum vitamin B12 levels, the certainty of evidence was upgraded from low to moderate due to the large and consistent magnitude of effect across studies, despite heterogeneity

RP-M: Conceptualization, Supervision, Writing original draft, Writing review & editing

Neurotherapeutics: J Am Soc Exp Neurotherapeut