The difference is not arbitrary
What It Is Glutathione LPT is a professional-grade nutraceutical featuring reduced L-Glutathione (GSH) encased in protective lipid spheres (liposomes)

GPxGlutathione Peroxidase Activity Colorimetric Assay Kit K762-100 (Abcam ab102530) 0.5 mU/ml BiovisionGPxColorimetric (340 nm)lysate30-400.5 mU/ml of GPx in samples ELISA (405450492630 nm/7k788 = 570 nm GPxGlutathione Peroxidase, GPxEC 1.11.1.9(oxidative damage) GPxGlutathione Peroxidase, GPxreduced glutathione, GSHoxidized glutathione , GSSG( lipid hydroperoxides) (alcohols)(free hydrogen peroxide ) GPx(free radical related disorders) BioVision(Glutathione Peroxidase, GPx)GPx (Glutathione Peroxidase, GPx)(Cumene Hydroperoxid)GSHreduced glutathione, GSHGSSGoxidized glutathione , GSSG GSSGoxidized glutathione , GSSGGSHreduced glutathione, GSHGR (glutathione reductase) NADPH NADPH340nmGPx(Glutathione Peroxidase, GPx) GPx(Glutathione Peroxidase, GPx)0.5mU / ml GPx | K762-100 GPx Assay Buffer NADPH (lyophilized) Glutathione Reductase Glutathione (GSH, lyophilized) Cumene Hydroperoxide GPx Positive Control (lyophilized)
Nat Microbiol 5 , 943954 (2020)
Molloy AM, Daly S, Mills JL, Kirke PN, Whitehead AS, Ramsbottom D, Conley MR, Weir DG, and Scott JM (1997)
When inspection records cannot be trusted, FDA questions every quality decision that relied upon those records