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These symptoms aren't always due to vitamin B12-deficiency anaemia, but if you have them see your GP. 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

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Each box in panels (a)-(e) shows the three quartiles (with the center line representing the median), and the whiskers extend to the minimum and maximum values that are within 1.5-fold of the interquartile range (n = 3-15 biological replicates from up to five donors)

L-Glutamine is an essential amino acid precursor to glutamic acid, an important source of energy for brain cells