It's not the perfect solution we'd all like it to be. But it is useful when you really cannot postpone your activities. It's very difficult to get the dosage right. Personally, the first time I took it I took the dose that it said on the packet - and it gave me C. So the next time I took half the recommended dose and that was much better. Sometimes I only take a quarter of the dose to begin with. After all it's easy enough to take more if needed, but you can't 'un-take' it if you have taken too much for your needs. If I have the time I prefer to stabilise myself by increasing my soluble fibre intake. But we don't always have that luxury.