The mosquitoes are really bad in Tenerife at the moment and we have been taking vitamin B100 to combat being bitten. They really do work. We've both noticed though that our urine is really brightly coloured since we started taking them and presumed that this is a side effect. There is very little about this on Google so we wondered if anyone here knew anything about it. Is this a perfectly normal effect or should we be concerned about it? Is it safe to take these pills daily on a long term basis? Any advice is most welcome.