How seriously should i take expiry dates on health supplements?

I have some saw palmetto exp 04/01 and vit c exp 08/04. are they safe to consume and do they lose potency with age?
Answer
Depends on the drug as to whether it becomes less effective or downright toxic. play it safe and throw them away. go to the doctors and get a new prescription or buy them from a pharmacist if they are not prescription drugs.