2. Citrus Fruits

A single middle-size orange, containing about 70 milligrams of vitamin C, might be the most obvious source of vitamin C. Vitamin C is rich in grapefruit and lemons as well can boost immunity.
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A single middle-size orange, containing about 70 milligrams of vitamin C, might be the most obvious source of vitamin C. Vitamin C is rich in grapefruit and lemons as well can boost immunity.