The United States Pharmacopeia (USP) is a scientific organization that sets standards for the quality, purity, strength, and consistency of medicines, food ingredients, and dietary supplements. Established in 1820, USP develops and publishes official compendia that serve as a reference for manufacturers, regulators, and healthcare professionals to ensure safe and effective products. USP standards are recognized and used by various stakeholders, including the Food and Drug Administration (FDA) and pharmaceutical companies. By providing guidelines and testing methods, USP helps to protect public health and ensure that products meet rigorous quality requirements before reaching consumers.