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Tumor necrosis factor-induced cerebral insulin resistance in Alzheimer's disease links numerous treatment rationales

They may arrange blood tests to evaluate: Inflammatory markers (ESR, CRP) to detect active inflammation Rheumatoid factor and anti-CCP antibodies if inflammatory arthritis is suspected Full blood count to assess haematological response to B12 treatment Thyroid function tests , as thyroid disorders commonly coexist with B12 deficiency Note that serum B12 levels are not typically measured to assess treatment adequacy once replacement therapy has begun, as they may not reliably reflect tissue stores

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A comprehensive study conducted in 2017 explained in detail the prevalence of vitamin B12 deficiency anemia in India

I also know people that are taking oral versions of this and I think that science has shown that thats completely useless