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I suggest you look up what factors increase and decrease B12 and see if you can manage your levels with those things

Rose NR, Bonita R, Burek CL (2002) Iodine: an environmental trigger of thyroiditis

A healthy level of Glutathione is crucial because the degenerative process of autoimmune disease destroys the mitochondria in affected cells, such as thyroid tissue in Hashimotos

Gut 69 , 11041115 (2020)

The Food and Drug Administration (FDA) classifies BPC-157 strictly as a research compound, prohibiting the product's use as an approved therapeutic or dietary supplement in human applications

It may mitigate oxidative stress, preserving vascular integrity and function