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I can appreciate the reasoning for not doing a B12 assay when checking her ferritin [or whatever iron indicator] but checking B12, Folate and Ferritin at the outset is probably wisest

The only exception was the conventional Neuromax B12 formulation, which led to significant changes in certain renal function parameters, such as serum levels of sodium, potassium, chloride, and bicarbonate, as well as in some hematological parameters, including the relative abundance of monocytes and basophils

Moreover, cosubstrate binding mechanisms are unique for the classical type of GPX1 but cannot operate in GPX3 and GPX4 (11) (Figure 3)

Scand J Gastroenterol (2017) 52(5):57784

10.1038/cdd.2010.150 61 HsiehC.-H.LinY.-J.WuC.-P.LeeH.-T.ShyuW.-C.WangC.-C

Responses of reactive oxygen species and methylglyoxal metabolisms to magnesium-deficiency differ greatly among the roots, upper and lower leaves of Citrus sinensis