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5, May 2013, pp

These are common signs of a B12 deficiency
These elevated levels reflect successful absorption and distribution of the vitamin into the bloodstream, where it can be utilized by tissues (source: National Institutes of Health)

Any perceived weight loss benefits typically relate to the correction of deficiency symptomssuch as fatigue and low moodwhich may indirectly improve an individual's capacity for physical activity and dietary adherence

Kenyan school children have multiple micronutrient deficiencies, but increased plasma vitamin B-12 is the only detectable micronutrient response to meat or milk supplementation
It stimulates noradrenaline, dopamine, and (less-so) serotonin receptors