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Results vary based on B12 levels, sleep, nutrition, stress, activity level, and overall health

The author GC declared that they were an editorial board member of Frontiers, at the time of submission

The introduction system to the instrument was a PerkinElmer S23 autosampler coupled to a SeaSpray glass nebulizer fitted to a quartz cyclonic spray chamber

Hayes MR, Borner T, De Jonghe BC

Patients taking certain medications (e.g., chloramphenicol may reduce the effectiveness of B12 therapy) or with risk factors for B12 deficiency (metformin use, proton pump inhibitors, nitrous oxide exposure, vegan diet) should discuss these with their healthcare provider