Tretinoin, Azelaic acid, Salicylic acid and Glutathione really gave me glass skin! : r tretinoin First FDA Approved Drug for Delaying Type 1 Diabetes Onset NIAID: National Institute of Allergy and Infectious Diseases Promising results from type 2 diabetes study Caribbean Broadcasting Corporation 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 type 1 diabetes Division of Endocrinology, Metabolism & Lipid Research Washington University in St. Louis