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Very good if youre low on energy

In response to the concerns noted above that reduce the sensitivity and specificity of serum B12 and confound the diagnosis of B12 deficiency, many investigators now recommend measuring one functional B12 biomarker (serum methylmalonic acid or serum homocysteine) if serum B12 concentrations appear inadequate to ensure a more accurate assessment of B12 status

Homocysteine in non-valvular atrial fibrillation: Role and clinical implications

Vitamin B12 deficiency in inflammatory bowel disease: Prevalence, risk factors, evaluation, and management

But, if the company describes its product as an immunity booster, the agencys authority is less clear

It may especially appeal to people who already maintain relatively healthy habits but feel frustrated by changes in energy, recovery, or body composition that seem resistant to traditional approaches