I'm a breastfeeding mother and am really desperate to loose some weight before my wedding, which is in a month. Is the colon cleanser safe?

I've done a quick scout around the web and found an example of a colon cleanse that you should avoid.

The GNC Garden Greens AcaiCleanse 48 Hour Acai Berry Detox (available here) is packed full of rubbish.

It has the following:
lemon juice concentrate
grape concentrate
cranberry concentrate
maple syrup
Acai extract
cayenne pepper

so you're paying for a mixed juice with little acai at all. This one might not particularly have anything dangerous in it, but it is just an example of why you should avoid these blended products.

I tried the above product and not only did it taste bad, it didn't really work. They makes claims on the bottle that are false and they expect you to believe that it will work in 48 hours?? Sure it's full of stuff that has a lot of antioxidants in it, but that's about it. I wouldn't use it again normal let alone as a breastfeeding mother.