Excellent dietary sources include : Meat and poultry : beef liver (particularly rich), lamb, chicken, and turkey Fish and seafood : salmon, trout, tuna, sardines, and shellfish (especially clams and mussels) Dairy products : milk, cheese, and yoghurt provide moderate amounts Eggs : particularly the yolk contains bioavailable B12 Fortified foods : breakfast cereals, plant-based milk alternatives, fortified yeast extracts (such as Marmite), and fortified nutritional yeast For individuals following plant-based diets, fortified foods and supplements become essential , as naturally occurring B12 in plant foods is negligible or in forms poorly utilised by humans
[DOI] [PubMed] [Google Scholar] 37.Sikiric P., Seiwerth S., Brcic L., Blagaic A.B., Zoricic I., Sever M., Klicek R., Radic B., Keller N., Sipos K., et al
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This is also helpful if there are multiple nutrient deficiencies
PMID: 29986520