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Several years worth of vitamin B12 can be stored in the liver so it may take a significant amount of time for a deficiency to occur
We also look into how these choices are backed by science and where the evidence gap exists
There is no evidence that vitamin B12 deficiency occurs as part of the underlying disease process in ME/CFS
infestans [PMID: 3530629] Laboratory literature summary: Distribution and properties of glutathione S-transferase from T
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