Any colon/intestine pills that actually work?

Hi,
well i have been really constipated lately and not making any real regular bowel movements, my face has since broken out with Acne and it sucks, i am looking at many products to cleanse the internal body and regulate BM but there are too many, wich one are you familiar with and what is your experience??

I am looking at extreme colon cleanse, super colon cleanse, zand quick cleanse system and many but can't decide.

http://store.yahoo.com/herbal-remedies-usa/collivcleanl.html