The shelf life of nutritional supplements is indicated near the UPC code on the label. There is normally a date stamp that shows the month and year of “recommended” expiry. We use a 2 or 3-year time stamp by regulation. However, UNIQUE E Mixed Tocopherols are pure, have no fillers, diluents, vegetable oil, or other additives that may turn the product rancid. What turns vitamin E rancid (causing it to oxidize and potentially expire) is the additional oils contained along with the vitamin E. As mentioned before, we do not have any extra oils – it is pure vitamin E oil that does not turn rancid. One of the best ways to check your softgels is to bite into one – it should have a mild bland taste.