The Elite™ Glutathione GSH/GSSG Ratio Assay Kit provides an ultrasensitive assay to quantify GSH in the sample. This kit uses a proprietary non-fluorescent dye that becomes strongly fluorescent upon reacting with GSH. With a one-step fluorimetric method, the kit can detect as little as 1 picomole of GSH or GSSG in a 100 μl assay volume.