Mandarin oranges resemble a common orange in shape but are smaller in size and come with a thin peel. Mandarins are harvested mostly during the winter season. Mandarin peels contain essential oils that are used in the perfume industry and skin care preparations. Tangerines is rich in vitamin C, beta-carotene, magnesium and vitamins B1, B2 & B3. It soothes the nervous system and has a positive effect on the digestive system. As far as skin care is concerned, it is used to help with stretch marks, increasing circulation and reducing fluid retention.