2021 Jul 1;385(1):e4
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The mechanism by which B12 deficiency distorts HbA1c centres on altered red blood cell turnover and erythropoiesis
IGF-1 LR3 has a prolonged half-life and significantly enhances protein synthesis in skeletal muscle. Florini et al., Endocrine Reviews Who Should Use 5-Amino-1MQ
According to StatPearls , patients with pernicious anemia require lifelong vitamin B12 injections and may want to consider dietary changes for B12 deficiency
A couple of 'things'': it is possible to have anaemia and haemochromotis at the same time (though you don't have a low Hb), there are conditions called iron out of balance and functional iron deficiency (associated with low or dropping ferritin), which can be caused by autoimmune disease, PA, absorption problems, coeliac disease, absorption problems and issues to do with gene mutations (HFE gene, mutations C282Y, H63D, and S65C) - and many other things as well