For 99% pure nicotine, you can source it from specialized suppliers catering to various industries such as pharmaceuticals, agriculture, and vaping. Companies like Nicotine India, Alchem International, and Inovogen Life Sciences offer high-quality nicotine products with such high purity levels. This level of purity is often sought after for specific applications requiring precise concentrations of nicotine. Prior to purchasing, ensure to verify the credentials and reputation of the suppliers to ensure reliability and product quality.