We recommend replacing products annually to make sure you're getting the best experience. But a good rule of thumb is that products without expiration dates (like cosmetics) are stable for 3 years from the time of manufacture, as long as they are stored at room temperature. You can find the manufacture date by the product lot number, located on the back, side or bottom of the product or embossed on the crimped end of the tube. It'll say LOT, followed by four numbers and then a letter (like LOT 0913L). The manufacture is the fourth digit. (So Lot 0913L was made in 2013, and is therefore good until 2016.) If you are interested in determining the exact age of a specific product, give us a call with the lot number and we will help you out.