Glutathione Tablets Before and After: Results to Expect The Adipokine Hypothesis of Heart Failure With a Preserved Ejection Fraction: A Novel Framework to Explain Pathogenesis and Guide Treatment JACC 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 Portal vein enriched metabolites as intermediate regulators of the gut microbiome in insulin resistance: Cell Metabolism