2. Hydrogen Peroxide
Vitamin C is best known for its benefits for infectious diseases. Research published in the Cochrane Database of Systematic Reviews found that regular supplementation with vitamin C had a “modest but consistent effect in reducing the duration of common cold symptoms.”3Kiwi fruits are exceptionally high in vitamin C, along with vitamin E, folate, polyphenols, and carotenoids. Research published in the British Journal of Nutrition found that a kiwi-packed diet reduced the duration and severity of upper respiratory tract infections symptoms in older individuals.4Other foods high in vitamin C include citrus fruits, red bell peppers, broccoli, Brussels sprouts, butternut squash, papaya, sweet potatoes, and tomatoes.