Kumara is a source of vitamin C and a good source of niacin plus contains dietary fibre and a dietary significant amount of potassium. Being one of the highest carbohydrate containing vegetables makes kumara an excellent source of energy.
The coloured flesh and skin of kumara supply an array of phytonutrients including phenolic compounds, flavonoids and carotenoids. Red or purple varieties contain anthocyanins (found in the skin of red varieties), and those with orange and yellow colouring are rich in beta-carotene. The richer the colour the more phytonutrients present.