In Reply to: Thanks posted by Chenoa on Sunday, 29. January 2012 at 08:38 Bali Time:
If you do some searching you'll find it's supposed to be raspberry juice that has the preventative effects. Most red cordial contains no juice of any sort, and those that do mostly have apple juice and red food colouring.
If 'red cordial' is working, it can only be the sugar that's doing anything, and so any colour/flavour of cordial would have the same effect.