The citrus fruit mandarin (Citrus reticulata) residues, which are generally discarded as waste in the environment, can act as potential nutraceutical resources. Processing of mandarin by-products potentially represents a rich source of phenolic compounds, mineral, vitamin C and dietary fibre, due to the large amount of peel produced. In this review content, nutritional values and phenolic profiles on by products of orange, lemon and mandarin has been dealed and also applicable mandarin peel tablet nutrients and bioactive outputs has been carried out.