99% pure nicotine refers to nicotine that is highly concentrated and free from impurities, with a purity level of 99%. This high level of purity is often achieved through careful extraction and purification processes. It is commonly used in various industries, including pharmaceuticals, agriculture, and the production of e-liquids for vaping. Due to its potency, 99% pure nicotine should be handled with caution, and proper safety measures should be followed to prevent accidental exposure or ingestion.