So2go is added to beverages at time of consumption to remove sulphite preservatives - 200, 222 etc. It does not affect the flavour or quality. No more wine, beer, Champagne headaches, red face, sinus or tummy upset. It was developed by a west Australian wine maker and has been helping millions of people across, Australia, New Zealand, South Africa, USA and Canada for years. So2go is made in WA.