I tried Colosan. It sucks. Oxypowder is definately hands down a superior product. And I'm not making any money by trying to sell anything, just in case I get accused of that. After reading the post they put at this " Oxypowder " bashing attempt, I believe even more that someone is just getting jealous and trying to sale more Colosan %¤#&!§-. Seriously people. Make your own judgements. Oxypowder has a 60 day money back guarantee. Try it and if it works for you, than great! If not, get your money back and try something else. Don't be fooled by people trying to bash another product and turn around and try to convince of how wonderful theirs is, it's the oldest, yet cheapest, trick in the sales book. I don't represent any product, I just know what works for me.