Creatine phosphate potassium salt, also known as phosphocreatine, is a specialty chemical and high-energy phosphate compound primarily used in biochemical and biomedical research. It functions as a rapid phosphate donor to regenerate ATP from ADP in muscle cells, neurons, and other high-energy-demand tissues. Key applications include studies of cellular energy metabolism, ATP-regenerating systems in cell-free assays, ischemia-reperfusion injury, cardiac dysfunction, muscular dystrophy, and neuromuscular disorders. Due to its rapid hydrolysis in aqueous solutions, it is supplied as a lab reagent rather than for consumer sports nutrition products.