Your Glutathione Index Defines How Your Cells Are Ageing Your Glutathione Index Defines How Your Cells Are Ageing C peptide is a biomarker for beta cell function. In other words, it's a measure of beta cell health and insulin production, and is critical to developing new disease modifying therapies for type 1 Glutathione Quantification GSSG GSH Quantification Kit Oxidized Reduced Glutathione Assay Dojindo Total Glutathione Test