... skin whitening l-glutathione reduced China glutathione ,we are the most professional manufacturer in China ,1.Specification(1).Assay:98.0 ... metals and organic solvents, etc.(5).Glutathione the most important function is to protecting the liver, treat various types of liver disease4 ... !(2). In a cool, dry and ventilated place seal storage how to skin white of l-glutathione