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Journal of the American Chemical Society, 131(42), 15078-15079

Who Might Suffer from a B12 Deficiency

Brain Fog and Cognitive Dysfunction: Methylcobalamin provides the active methyl groups necessary to produce SAMe, which is required for the synthesis of crucial neurotransmitters like dopamine and serotonin

Injections are indicated when there's confirmed severe deficiency, pernicious anemia (an autoimmune condition where intrinsic factor is absent), or documented malabsorption that prevents oral B12 from reaching adequate levels
