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B12 levels can decrease with age, as well as being lower in people who have undergone weight loss surgery, or suffer from multiple sclerosis, pernicious anaemia, Crohns or celiac disease
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It plays a vital role in energy production[2], red blood cell[3] formation and nervous system function[4], making it crucial for overall health
Pinzon RT, Schellack N, Matawaran BJ, et al
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You may think that the quick fix to a vitamin B12 deficiency is to eat foods that are rich in B12 or to take supplements, but the solution may not be that simple, as even meat eaters can be deficient in B12
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