The aim of this study is to determine the antioxidant capacity of underutilized fruits in Malaysia namely Milk apple (Syzygium malaccense), Malay apple (Syzygium malaccense (L.) Merr. and Perry), and Water apple (Syzygium aqueum). Synthetic antioxidants (BHA and BHT) commonly used in the food industries may not be as safe as it was presumed earlier. As BHA and BHT may be carcinogenic, it is important to look for new sources of natural antioxidants from fruits and vegetables. Freeze dried samples extracted with acetone and water were measured by ferric 1, 1-diphenyl-2-picrylhydrazyl (DPPH) radical scavenging and Ferric Reducing Antioxidant Power (FRAP) assays. Acetone extract (50%) showed higher values for both DPPH and FRAP assays compared with water extract. Milk apple has the highest DPPH value of 95.26% inhibition of DPPH. Milk apple also showed the highest FRAP value with 8722.22 µM of Fe (II) per gram of freeze dried sample. There was a significant difference (P < 0.05) in the types of extraction used. Antioxidant capacities of the samples are in the following order: Milk apple > Malay apple > Water apple. Proximate compositions and mineral contents of the samples were determined too. The samples can be used as a source of natural antioxidants.