It's officially cold and flu season, which means our immune systems will be working overtime. You've probably heard that now is a good time to load up on vitamin C, which supports immune function so our body can fight off infections.

Vitamin C is found naturally in many foods, added to some food products and available in supplements.

“Vitamin C is a powerful antioxidant that plays a key role in immune health and fights inflammation," says Natalie Rizzo, registered dietitian and TODAY.com food editor.

Antioxidants like vitamin C help protect our cells from damage due to harmful free radicals, which increase the risk of chronic disease, according to the National Institutes of Health.

In addition to keeping our body's defenses strong, vitamin C also aids in the growth and repair of tissu

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