Well, g with an i, y, or e next to it may have a soft g sound like juh as in judge, gyrate or gist. G with an i next to it may also have a hard g sound as in gilded or gizmo. I can't think of any examples of g having a soft sound when it is followed by a 'u'. I have lots of examples of g having a hard sound: gust, guzzle or gullible. So you may think that I have a lot of gumption to make this comment but my vote goes with the hard g sound for Regumate. If you vote for the soft g sound then maybe you'd better start saying you will juzzle your drink or not be too jullible.