The highly significant correlation between consumption of fats and oils and death rates from leukemia and malignant neoplasia of the breast, ovaries and rectum among persons of 55 years may be a reflection of greater lipid peroxidation. To reduce the possible effect of lipid peroxidation, this study focused on the phytochemical screening and determination of the antioxidant level of cabbage (Brassica oleracea) and kangkong (Ipomoea aquatica) leaf extract. The two plants were selected based on their antioxidant property. The phytochemical tests include the Wagner’s test for Alkaloid; Wilstater Cyanidin Bate- Smith and Shinoda Tests for Flavonoid; and Froth test for Saponin. On the other hand, the reducing power method for antioxidant level was performed using UV-VIS spectrophotometer and Vitamin C was used as the standard. Results reveal that cabbage and kangkong leaf extracts are both positive for flavonoid and saponin however no detection for alkaloid. The level of Vitamin C in kangkong is 0.34 ± 0.0525 while cabbage is at 0.30 ± 0.0453. Independent t-test analysis shows that there is no significant difference (p>0.5) between the level of vitamin C and the two plant extracts. This indicates that both plant extracts showed potential amount of Vitamin C and may exhibit antioxidant property.