As long as it hasn't been opened, it should be fine. Supplements don't really expire. They more have a best before date.
Generally if the product is 1 year expired or less, it should be still fine to use. If it expired longer then a year ago, I wouldn't risk it and throw it out (or give it to a friend). Especially food based supplements such as protein powder and fish oil, I wouldn't use any product that expired over 1 year ago.