Orange or red colored citrus fruit; often more tart than most oranges. Tangerines are a great source of vitamins C and B, potassium, dietary fiber, pectin, and folic acid; these combined help boost your immune system, reproductive health, and promote good eye health. Tangerines also contain hesperidin,a flavonoid that can help lower cholesterol and blood pressure; can help prevent arthritis and asthma flare-ups; and can help fight cancer and other illnesses.