Designed for use with 50/50 Shortfill e-liquids, this nicotine booster shot by NicNic in a 50/50 PG/VG blend will boost your nicotine-free e-liquid into a nicotine-containing liquid.? This is a 10ml sized bottle containing 18mg/ml nicotine and is flavourless.?When added to a 50ml nicotine-free shortfill bottle, this will mix to a total of 3mg (2.7mg/ml). For larger shortfill bottles e.g. 100ml (80ml of e-liquid), add two nic shots to mix to a 3mg strength.