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Sublingual glutathione Sublingual formulations (lozenges or liquids held under the tongue) bypass the GI tract entirely, absorbing directly through the oral mucosa into the bloodstream
The only way to know is to measure it. Were obviously big fans of measuring over here
That takes randomized, controlled clinical trials
The short plasma half-life of GHK-Cu is one reason why twice-daily dosing schedules are sometimes used in injectable protocols, though the peptide's downstream gene expression effects appear to persist well beyond its plasma clearance
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