Can tea tree oil be used after expiration date?

Tea tree oil does not have an official expiration date, but over time it can become less potent and effective. The expiration of tea tree oil is determined by the manufacturer, and it is usually marked on the bottle. In general, tea tree oil should be used within two to three years after the date it was purchased. Expired tea tree oil can still be used, but it will not be as potent and effective as it should be.