"NV Liquid (Nicotine Vapor Liquid) use an approximate base blend of 60% Propylene Glycol to 40% Vegetable glycerin formulated to produce a large amount of vapor, and reasonable 'hit.' They are also formulated to provide the maximum amount of flavor, without residual buildup forming inside of your atomizer. NV Liquids are produced by iVape in a dedicated clean mixing room, designed to comply with AEMSA guidelines, which are based on the regulations for FDA Food Preparation, and OSHA safety standards. We test our liquids for accuracy and purity via self-titration, and third-party GCFID."
quoted from ivape.com