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That does not mean it is ineffective for the right patient

Food and Drug Administration (FDA) for the diagnosis, treatment, cure, or prevention of any disease or medical condition

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

They are used for patients with multiple deficiencies or specific needs