The shelf life of Ovaltine varies depending on the specific product and its packaging. Generally, powdered Ovaltine products are designed to have a shelf life of approximately two years when stored in a cool, dry place. It is important to check the packaging for a "best by" date, as this can provide guidance on optimal freshness and quality. Once the package is opened, it is recommended to consume the product within a few months for the best flavor and nutritional value. If the product shows any signs of deterioration, such as an off smell or changes in texture, it is advisable to discard it. For the most accurate information regarding a specific Ovaltine product, it may be helpful to refer to the company’s official website for detailed guidance on storage and expiration.