Oxidants and antioxidants imbalance in tissues might cause oxidative stress which could cause cell damage and dead. Malondialdehyde, a product of lipid peroxidation. often used as one of indicators to detect the oxidative stress damaged in tissues. Empirically, peo¬ple often used onion (Allium ascalonicum L.) after having high lipid diet. The aim of this research was to analyze effects of onio…