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Low methionine levels can affect the production of A-adenosylmethionine (SAMe), a major methyl donor for the central nervous system and an essential nutrient required for the production of neurotransmitters

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The problem

Laboratory evaluation typically shows elevated TSH, low free thyroxine (fT4), and increased TPOAb titers, while thyroid ultrasound reveals diffuse hypoechogenicity and heterogeneous parenchymal texture

For long-term storage, -20 C freezer storage is the conservative research default used across many peptide-handling references for dry lyophilized materials