USP nicotine refers to nicotine that meets the standards set by the United States Pharmacopeia (USP). This designation ensures that the nicotine has been manufactured, tested, and certified to meet specific purity and quality criteria established by the USP. USP nicotine is commonly used in pharmaceutical applications, including nicotine replacement therapies (NRTs), where purity and consistency are essential. It guarantees that the nicotine product is free from impurities and contaminants, making it suitable for use in medical and therapeutic purposes. When purchasing USP nicotine, it's crucial to ensure that the supplier is reputable and adheres to the USP standards to ensure product quality and safety.