5 Best Supplements to Boost Your Immunity This Cold and Flu Season
by Cascade Ice on September 23, 2025
As the weather cools and cold and flu season ramps up, keeping your immune system strong becomes more important than ever. While good nutrition, quality sleep, and stress management are the foundation of health, certain supplements can give your body the extra support it needs to fight off seasonal bugs. Here are five of the best supplements to consider for immune health, along with a simple but often overlooked tip—stay hydrated!
Vitamin C
Vitamin C is one of the most well-known immune-boosting nutrients. It’s a powerful antioxidant that helps protect cells from damage and supports the production of white blood cells, which fight infections. Since your body doesn’t store or produce vitamin C, daily intake is essential. Supplements can fill in gaps, especially during the winter months when fresh fruits and veggies may be less available.
Vitamin D
Often called the “sunshine vitamin,” vitamin D is crucial for regulating immune responses. Low levels of vitamin D are linked to higher susceptibility to infections, particularly respiratory illnesses. Since shorter days and cooler temperatures limit sun exposure, supplementing vitamin D during fall and winter is a smart move for most people.
Zinc
Zinc plays a vital role in immune cell development and communication. It also helps the body heal wounds and fight off invading bacteria and viruses. Research shows that taking zinc at the first signs of illness may reduce the duration of colds, making it an especially useful supplement to keep on hand.
Elderberry
Elderberries have been used for centuries as a natural remedy for colds and flu. Rich in antioxidants and bioflavonoids, elderberry supplements may help reduce the severity and duration of symptoms. Syrups, gummies, and capsules are all popular options for boosting immune resilience.
Probiotics
A healthy guts is directly linked to a strong immune system. Probiotics—beneficial bacteria found in fermented foods and supplements—support gut health and help regulate immune responses. Taking a daily probiotic may improve your body’s ability to defend against seasonal infections.
Don’t Forget: Stay Hydrated
While supplements can give your immune system a valuable boost, one of the simplest and most effective ways to stay healthy is by drinking enough water. Hydration helps flush toxins from the body, keeps mucous membranes moist (making it harder for viruses to take hold), and ensures nutrients are properly transported throughout your system. Aim for at least 8 cups of water a day and consider adding herbal teas or broths for extra warmth and hydration during the colder months. And if regular water just doesn’t compel you to get your water intake up, try a Cascade Ice Sparkling Water!
While supplements certainly aren’t a magic shield against illness, they can provide meaningful support for your immune system when paired with a healthy lifestyle. As always, consult with your healthcare provider before starting new supplements to make sure they’re right for your individual needs. This cold and flu season, a combination of nutrient support, hydration, rest, and mindful habits will help you stay strong and resilient.
What types of supplements do you take to prevent illness? Let us know in the comments below or share a photo! Remember to “like” and “follow” us on Facebook and Instagram.
