The best food sources for vitamin B12 are meat and dairy products
NHS approach to B12 deficiency: NICE Clinical Knowledge Summaries recommend investigating B12 deficiency in patients presenting with macrocytic anaemia, unexplained neurological symptoms, or risk factors including pernicious anaemia, gastrectomy, malabsorption disorders, metformin use, proton pump inhibitors, or nitrous oxide exposure
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It can also result in anemia, which leads to fatigue, weakness, and shortness of breath
Public Health England, NHS England and NICE have not been able to provide any clinical evidence either
initial results have been reported at an earlier Pernicious Anaemia Society meeting, and these presentations can be found online on the PAS website and / or YouTube