The different parts of M. oleifera such as the roots, leaves, flowers, fruits, and seeds are also known to be good sources of phytochemicals/secondary metabolites. Phytochemicals are non-nutritive plant chemicals that contribute to the flavor, texture, smell, and color of plants. Based on their chemical structure, phytochemicals are divided into five classes: polyphenols, carotenoids, alkaloids, terpenoids, and sulfur-containing compounds. The majority of these phytochemical secondary metabolites are also present in the Moringa tree. However, the amount of these metabolites in M. oleifera extracts varies according to geographic location, soil composition, sun exposure levels and climatic conditions. Moreover, the method and solvents used for extraction can modify the content of the compounds obtained from the plant, particularly phenols and flavonoids.