It has an exp date on it, if it is not expired I am sure it is fine, not everyone has the same side effects from interferon.
Hi.. there is nothing wrong or defective with your INF. The fact is that many people have very mild or no side effects from INF. Some get exactly what you are getting some mild aches and pains..
Good look with your treatment..
Will
And thanx to you also. Sure is useful to have this support.