The possibility of stabilization of vegatable oil with natural antioxidants isolated from plants is presented in this paper. The antioxidative activites of five natural antioxidants: scullcap and hawthorn extracts, α-tocopherol, citric and ascorbic acid in sunflower oil stored at 50°C and light 3600-3900 lx were studied. The hawthorn extract exhibited the best antioxidant effect, as determined by peroxide value and TBARS measurements. The synergistic effects of α-tocopherol, citric and ascorbic acid on hawthorn and scullcap were investigated, too. The mixture hawthorn with α-tocopherol gave the best antioxidant effect, while the mixtures scullcap with citric and skullcap with ascorbic acid showed prooxidant effects.