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Third-party COA: Look for HPLC purity testing per batch from an independent ISO/IEC 17025-accredited lab
2003 Dec;78(12):1463-70
It is produced from the precursor thyroglobulin (this is not the same as thyroxine-binding globulin [TBG]), which is cleaved by enzymes to produce active T 4
It is not subject to feedback inhibition by GSH, and its substrates gamma-glutamylcysteine and glycine are rapidly ligated to form GSH
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