Mastermix E-liquid uses only USP propylene glycol and vegetable glycerin, flavoring and nicotine in our juice. We do not add anything to our e-juice that should not be there. There are no preservatives, caffeine, vitamins or any unnecessary ingredients in our product. Each of our ingredients is independently tested for purity, and our in-house testing insures you are getting the final product you paid for. Our liquids come in varying sizes from 5ml to 500ml. We have taken every step to ensure the highest quality, and the best tasting e-liquid possible. You can customize any flavor to suit your e-cig equipment be it a clearomizer tank, an RDA/RBA or what have you. We have been making electronic cigarette e-juice for over 5 years and we understand the need for quality ingredients and craftsmanship. MasterMix E-Liquid is devoted to quality and customer care and it truly shows in our products. We hope you enjoy it!