Out of desperation (5 hours in a car I had run out of water and only had a bar with me) I ended up having two bars in one day. Now I know that's not meant to be ok on Cambridge. But I will never do that again. I got very windy and noisy tummy pops. They were quite stinky too! And poos were a little quick and loose. Luckily I'd made it out of the car. Y the time the troubles hit! Not had any problems with other products though!