Spectrum Chemical manufactures and distributes fine chemicals with quality you can count on including those with CAS number 27025-41-8, Whether you call it L-Glutathione, Oxidized, (gamma-Glu-Cys-Gly) (gamma-Glu-Cys-Gly) [Disulfide Bridge: 2a-2b] or Oxidized Glutathione you can be assured the L-Glutathione, Oxidized products offered by Spectrum, meet or exceed the grade requirements or specifications for each individual product.