Does creatine expire What will happen if you take creatine that has been expried for more than one year WIll it damage your liver or cause any harm to your body Professional opinion appreciated?

It's best not to take risks and discard expired supplements. Expired creatine is probably not dangerous, only less effective and/or less potent. There's no reason why creatine (expired or not) would damage your liver. Unless some bacteria have begun to form, the creatine would probably not be dangerous. Most supplements do carry an expiration date, and it's probably just good practice to follow these dates. To be on the safe side, you should discard expired creatine or any other supplements. At the same time, don't fret if you did consume some of the expired creatine.