Hmm... sounds like the cascarda and ginger in the product is too much for your colon right now... if you're having regular bowel movements, switch to formula #2 and if the burning continues, then you'll know it's more diet related.

I tried one laxative that gave me a burning feeling, but it was before the actual BM. That's why I think it's the stuff actually IN the product, since your burning is WITH the BM, when it's actually passing thru the colon.

Sounds like you're losing old mucous, and thus your colon is a little more exposed to irritants than usual.

Just a guess - ! :) Switching to #2 will help you deduce what's going on better. :) Good ol' logic. ;)