NKTR E-Liquids became a mainstay here at Vivo when we discovered the amazing flavor profiles that these TFN juices offered. NKTR E-Liquids use Tobacco Free Nicotine (TFN) which is a huge step toward our independence from Tobacco and Tobacco made Nicotine products. When a product offers us the finest and highest grade Tobacco Free Nicotine along with superb and flavorful profiles it definitely peaks our interests. The vape community as a whole seems keen to the NKTR brand. The evolution of this company has been solid mainly due to the simplicity and top tier ingredients they use. NKTR released the Sour line in 2016 with flavors like Sour Apple, Sour Strawberry and Sour Watermelon which all contain TFN Nicotine. NKTR manufacttures some of the freshest cleanest blends available in the vapor industry today. The constant commitment to Tobacco Free products shows us NKTR really is a leader in the vapor industry.