the way expiration works is they take a few kilograms of the product, 100% pure, and put it in a warehouse for X number of days/years. They test it again and as long as its 99.99% pure still they say its still good. Now that doesnt mean that its <99.99% pure after expiration. All it means is they didnt let it sit that long. If they let it sit 3 years and its still pure they say "ok 3 years is good enough". Doesn't mean 4 or 5 or 6 isnt good too. I say ur fine.