Boosting immunity Extreme vitamin C

Vitamin C seems to work best as a preventative for days of physical exertion outdoors in cold weather, suggests one study. To power wound healing, artery health, and collagen production as well as immunity, include several food sources in your diet daily. Choose from kiwi, mango, papaya, melon, blackcurrants, strawberries, raspberries, citrus fruit, tomatoes, and rosehip tea.