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For active B12 deficiency, most clinicians recommend weekly or biweekly shots for the first 4 to 6 weeks, then a maintenance shot every 1 to 3 months

Neurotransmitter system interactions: Published research has examined interactions with dopaminergic, serotonergic, and GABAergic systems in animal models, contributing to its use in neurobiological research contexts

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found only in foods of animal origin Foods that are high in vitamin B 12 (g/100g) include: Liver (2658) Beef and lamb (13 Chicken (trace) Eggs (12.5) Dairy foods (0.32.4) In normal humans the absorption of vitamin B 12 from foods has been shown to vary depending on the quantity and type of protein consumed