On the thyroid forum they usually suggest private testing of all the thyroid hormones
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Furthermore, these findings suggest early synaptic failure before the disease fully developed, as the reduction of NPTX2 matched memory problems as well as shrinkage to the medial temporal lobe
For more details, please refer to the manual: Handling and Storage of Synthetic Peptides References Frias JP, Deenadayalan S, Erichsen L, Knop FK, Lingvay I, Macura S, Mathieu C, Pedersen SD, Davies M
Even considering all of these factors you need to understand that checking vitamin B12 levels in the serum still isnt the best way to evaluate for B12 deficiency