The diagnosis of Diabetes in your cat may at first seem overwhelming. This article is intended to answer many of your questions. Insulin Storage Insulin has a limited “shelf-life” so you should stop using it before the expiration date on the bottle. Generally, it is best to store insulin in the refrigerator to make sure it retains its potency. Lantus® insulin can be kept for up to 6 months if refrigerated. If you see any color change or cloudiness in the insulin bottle, disca