I have a large bottle of Optimum Nutrition Creatine Mono (2000g) thats about half full but I just noticed the expiration date of 6/06. Anyone know about the shelf life of this stuff? Is it still good? Just can't seem to bring myself to toss out 1000g of creatine. I've been out of the creatine loop for a while, so if I do replace it should I get the ethyl type or some other type of creatine?