If you got them where I think you did, then they say in the title the expiration along with "guaranteed fresh". That's why the price is such. I picked up a few along with some Oxyguno for some future cut stack simply because it was so cheap. The shelf life is usually far beyond what the product is dated for providing it was warehoused and you store it in a cool, dark,low moisture, environment and the bottles are sealed. Let us know how it goes when you begin your cycle. Are you planning to stack this or run solo?