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However, studies assessing bioavailability of B12 from specific food sources in healthy participants have shown that absorption varies depending on both the specific food product and the magnitude of the dose, ranging from 36%24% for egg products (dose 0.30.94mg, respectively), 83%52% for lean meat (dose 0.545.11mg, respectively), 42%30% for fish (dose 2.113.1mg, respectively) and 49%4.5% for liver products (dose 0.538mg, respectively) (Doets et al., 2013)

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Amorim AMB, Piochi LF, Gaspar AT, Preto AJ, Rosario-Ferreira N, Moreira IS

Additional info National Heart, Lung, and Blood Institute (NHLBI) Learn more about Vitamin B12 deficiency Treatment options Care guides Further information Always consult your healthcare provider to ensure the information displayed on this page applies to your personal circumstances.

Support your body with nutrient-rich foods, quality supplementation, mindful sun protection, and a skin care routine that works withnot againstyour biology

Signs of Vitamin B12 deficiency include: Fatigue Heart palpitations Pale skin Constipation Loss of appetite Mental fog Nerve problems Dr