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However, some randomized controlled trials did not find significant cognitive improvements, particularly in short-term assessments
What the research actually shows Let us be direct about what the evidence supports and what it does not
Bibliography Robbins, Zachary
Common examples include fatigue or low energy with normal blood results, brain fog or reduced concentration without confirmed vitamin B12 deficiency, stress-related exhaustion or burnout, increased metabolic demand such as during illness recovery, high workload, or intense training, restrictive or inconsistent dietary intake, or suspected poor oral absorption despite normal serum levels
That landscape includes lifestyle care, metformin, GLP-1 receptor agonists, dual agonists, SGLT2 inhibitors, insulin, and other glucose-lowering therapies