Potassium hydrogen L-aspartate is the monopotassium salt of the amino acid L-aspartic acid. It exists as a white crystalline powder with high water solubility, serving as a bioavailable source of both potassium and aspartate ions. Its primary application is in the pharmaceutical and nutraceutical sectors. As a drug active pharmaceutical ingredient (API), it is used in mineral supplements and electrolyte replenishers to correct potassium deficiencies, particularly in conditions like hypokalemia. The aspartate moiety acts as a carrier to facilitate the transport of potassium ions across cell membranes, enhancing absorption and reducing gastrointestinal irritation compared to inorganic potassium salts. In the food industry, it functions as a nutrient fortifier and a mineral supplement in sports drinks and functional foods. The compound is generally recognized as safe (GRAS) when used appropriately. It is stable under normal storage conditions but should be kept in a tightly closed container away from moisture. Its dual role as both a therapeutic agent and a nutritional additive makes it a versatile product bridging the pharmaceutical and functional food industries.