C5H8O4 is a chemical compound known as citric acid, which is commonly found in citrus fruits like lemons and oranges. It is a weak organic acid that plays a crucial role in the Krebs cycle, a key metabolic pathway for energy production in living organisms. In addition to its natural occurrence, citric acid is widely used in the food industry as a preservative and flavoring agent. It helps enhance the taste of various products and acts as an antioxidant, preventing spoilage. Its versatility also extends to cleaning products and cosmetics, where it serves as a pH regulator.