Basic Information about Cardarine Endurobol GW-501516 GW501516 (also known as GW-501,516, GW1516, GSK-516 and Endurobol, is a PPARδ receptor agonist that was invented in a collaboration between Ligand Pharmaceuticals and GlaxoSmithKline in the 1990s, was entered into clinical development as a drug candidate for metabolic diseases and cardiovascular diseases, and was abandoned in 2007 because animal testing showed that the …