there can be, you should ask a doctor before you try to. If you do decide to try to and want to purchase colon cleansing products, be careful about which ones you choose, try to go with one that is well known and has a lot of good reviews. I used Nature Cleanse and it worked really well for me. I have also heard about Purity cleanse a lot. both of those are well known and have good ratings.
There are side effects to colon cleansing. These may include stomach cramps and nausea. The side effects, however, are minor and are tolerable.