Question about colon cleansing?

Is there any validity to all these colon cleansing claims? My husband heard an infomercial about one product the other day and wanted me to research it. So I did. A couple of the products I’ve seen sold show some very grotesque pictures of things that supposedly came out of thier colon’s (and I’m left wondering if all of that was really in there, how am I alive? Wouldn’t I be so backed up that I would die of sepsis or something?). Other products seem like nothing more than high fiber pills with the promise that it will make you lose weight, give you more energy, and make you healthier and they charge .00. So if colon cleansing is really something that should be done, how do you know what products are legit and which are scams?