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The following symptoms of vitamin B12 deficiency are listed by Bupa: Feeling very tired Breathlessness even after little exercise Heart palpitations Headaches A reduced appetite A sore mouth and tongue Avoiding vitamin B12 deficiency Experts say adults aged 19 to 64 require around 1.5 micrograms (mg) a day of vitamin B12, and you should be able to get this through your diet
Another proposed mechanism involves competing interactions at growth factor receptor sites
Fisher, G
Each tablet contains a precisely measured 500 mcg dose for accurate, reproducible in vitro and in vivo research applications
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