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Ann Rheum Dis (2015) 74(1):1926

Sublingual formulations (tablets or sprays placed under the tongue) are marketed as having superior absorption, but current evidence does not conclusively demonstrate that they offer significant advantages over standard oral tablets

The benzyl alcohol preservative inhibits bacterial growth, allowing the same vial to be used over several days or weeks without contamination

Possible explanations include: Placebo effect : Expecting increased energy may influence perceived alertness Correction of deficiency : People with B12 deficiency often experience fatigue and disrupted sleep patterns

Methylcobalamin plays a crucial role in maintaining visual health