Over the years I've used a variety of oxygen based colon cleansers but have personally always experienced reactions to them so had given up on using them. Increasingly frustrated with all my digestive issues, I noticed Oxy-Powder on the website and decided to give it a try and I'm so glad I did. I started with a very small dose and have slowly increased to effect a real cleanse and have never once experienced any sort of weird reaction but with successful cleansing results. It feels like a much more gentle product and although it's very effective at doing it's job, doesn't feel as harsh as other products I've tried. I wouldn't usually write a review for a product however having been using this for 3 weeks so successfully I thought this might just help someone else who hasn't had success with other products.