Turmeric: Turmeric is the powerful ingredient that gives curry its bright yellow color and contains the healing compound curcumin. It also boasts an excellent ORAC (Oxygen Radical Absorbance Capacity) value of 127,068—a measure of the antioxidant content of foods. The antioxidants in turmeric, including polyphenols, flavonoids, and vitamin C, are a wonderful boost for your immune system.

Ginger: Ginger belongs to the same family as turmeric (Zingiberaceae) and has a similar root-like appearance but is lighter in color. Ginger also contains a high level of antioxidants, along with some notable antimicrobial and antibacterial properties that will keep you stay healthy.

Lemon: Lemons contain high levels of vitamin C, as well as strong antibacterial and antimicrobial properties, making this cheerful fruit a superfood for strengthening your immunity.

Apple: The antioxidants in apples help protect your cells from oxidative stress and free radical damage, which in turn helps to keep your immune system strong and vital. 

Celery:  Not only does celery have a robust antioxidant profile, but research also shows that celery has antibacterial, antifungal, and anti-inflammatory properties, all of which will help your immune system stay strong.

Carrot: Carrots are full of beta carotene, which strengthens the body and protects against the free radical damage that can lead to illness. Carrots are also chock full of many important vitamins (such as vitamins A, C, and E), carotenoids, and polyphenols that offer a variety of health benefits, including strengthening the immune system.

Orange: Oranges are well-known for their high level of vitamin C, which can boost your immunity and be an asset during the cold and flu season. Vitamin C has been studied extensively and may help decrease the duration and intensity of the common cold.

Beets: Known for their health-promoting benefits and impressive nutrient profile, beets are a healing food. Not only are beets full of health-promoting antioxidants and trace minerals, but they are also loaded with dietary nitrates—naturally occurring inorganic compounds—that convert to nitric oxide in the body. Nitric oxide is used in the body as part of a toxin defense system, protecting you from infectious organisms. It is also an important component of many immune and inflammatory cell types.

Kale: Kale is known as a superfood because of its incredibly high antioxidant levels, including the immune-boosting vitamin C.

Pear: Pears are also a great source of vitamin C.  as a potent ingredient to soothe the lungs and relieve a cough during cold and flu season.

Cucumber: Cucumbers are extremely hydrating (they are approximately 96 percent water), and contain a range of antioxidants that promote a strong immune system.