Shit, I've got amps of organon Sust that expired in 2006. If I could remember where I put them, I'd crack them open and pin it lol. Expiration dates are BS. Did you know it's not even required for them to be on food like milk? They do it so you buy more. Milk almost always last longer than the expiration date. So does almost everything else you buy. Gear is just oil, hormone and solvents. If stored properly it should last a very long time. I've got enough test to last me 4 years. I wouldn't hesitate to use it in 4 years.