[Kevin]

I'm sure it all depends on what it is and its individual properties.

Please don't take what I say as experienced or valid medical advice.

However, a friend of mine's dad is a doctor. He's given me long-expired samples. Most things are safe and many don't lose their potency at all. The FDA just requires a certain expiration date be placed on the products. Sometimes the date is completely arbitrary.

But again, I'm sure it depends on what it is we're talking about.