USP nicotine refers to nicotine that adheres to the standards set by the United States Pharmacopeia (USP), an organization responsible for establishing quality standards for medications and other healthcare products in the United States. This designation ensures that the nicotine meets specific criteria for purity, potency, and quality, making it suitable for pharmaceutical use. USP nicotine is commonly used in nicotine replacement therapy products such as patches, gums, lozenges, and inhalers to help individuals quit smoking. It undergoes rigorous testing and quality control measures to ensure safety and efficacy. When purchasing USP nicotine, it is essential to choose products from reputable suppliers that comply with USP standards.