Your immune system can get bogged down or tired when you aren't well-rested or nourished. While a wide range of factors affects the health of your immune system, your diet and lifestyle choices are the factors within your control. In this guide, you'll learn how to best improve and support the health of your immune system in the long term. 

For most of us, it's become a habit. When purchasing something consumable, such as food or over-the-counter (OTC) medications, we often first check for an expiration date. Fresh fruit, for example, has a finite shelf life — a fact that will become undeniably apparent in due time. But do vitamins and supplements expire?