TFA flavour concentrates are Naturally and Artificially Flavoured. Made in the USA by The Perfumers Apprentice & Rebottled by Vapour Depot in the UK. Available Sizes: 10ml, 30ml, 100ml Recommended Mix (Single Flavour): 3% Recommended Mix (Multiple Flavour Recipe): 1.5% Requires mixing with Vegetable Glycerin & Propylene Glycol before can be vaped. TFA Vanillin PG Concentrated Flavouring A large range of flavours for use in various applications such as: Baking, Candy-Making, Carbonated water (soda flavours), and many other applications that have fun with flavours!. Vanillin crystals dissolved in a 10% (Mixture) in Propylene Glycol. This is not a complete flavour on its own, but it can be a useful component for use in blending vanilla-infused flavours.