Effectiveness of Clenbuterol

I have been on several cycles of clenbuterol in the past. My most recent order of clen I recieved, Ventolase brand had an experation date on it. None of the clen I orderd in the past has had an expiration date on it. This new order of Clen has an exp May 00 imprinted on the back of the foil strips. Does any one know if it will still be effective. SHould I just return it, or is it still safe to take. Any advice will help.