Echinacea – Feeling a bit "eh"? Try supplementing with echinacea. Tried and true for centuries, this flowering plant has been used to help support immune system responses. Vitamin D – Especially during winter months everyone needs a little sunshine in their life and that's where vitamin D, the sunshine vitamin, comes into play. This is an important letter vitamin that helps protect and support your immune system health and should be taken on a regular basis for overall full body support. Elderberry – Elderberry extract has a reputation for promoting a healthy immune system because this powerful plant is chock full of antioxidants to keep you healthy. Most commonly elderberry is taken orally, either by syrup or a convenient, 5-day formula for fast-acting immune support. Vitamin C – If you have tried chugging endless amounts of orange juice to support your immune system, you may want to try an easier solution to get the health supporting benefits of vitamin C. Vitamin C is the go-to letter vitamin to help support a strong immune system by protecting against oxidation with 1,000 mg per tablet. Probiotics – Probiotics are more than just gut friendly bacteria. In fact, these microorganisms help support your immune system in a variety of ways. A specific strand of five different probiotics in Life Extension's FLORASSIST® Winter Immune Support can help you keep your immune system ready to go. This proprietary blend helps support nose, throat and respiratory health while encouraging immune cells to respond in a timely manner for on-the-go seasonal support. NAC – N-Acetyl-L-Cysteine or NAC is an easily absorbed nutrient and powerful antioxidant that protects your cells from oxidative stress. Each NAC capsule provides over 600 mg of targeted support to help protect your overall health and keep your immune system strong—no matter what the season throws your way.