Excellent dietary sources include: Meat : beef, lamb, and pork (particularly liver, though liver should be limited in pregnancy due to high vitamin A content) [3] [4] Fish : salmon, sardines, and tuna (limit tuna to 2 steaks or 4 medium cans weekly due to mercury content) Poultry : chicken and turkey Dairy products : milk, cheese, and yoghurt Eggs : particularly the yolk For women following plant-based diets , obtaining sufficient B12 from food alone is challenging, as plant foods do not naturally contain bioavailable B12
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It supports nerve cell function and the production of neurotransmitters, which are responsible for communication between brain cells
However, like any medical treatment, it is not without potential side effects
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