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The mangrove fruit Sonneratia apetala Buch.-Ham. is extensively consumed by the people of coastal Bangladesh especially adjacent to the Sundarbans’ forest. Seeds consist of very high content of polyphenols (300 ± 8.2 mg GAE/g extract), flavonoids (30.6 ± 0.7 CE/g extract), anthocyanins (2.3 ± 0.03 μmol/g extract) and vitamin C (4.0 ± 0.08 mg/g extract). The IC₅₀ values for DPPH and NO free radical scavenging were 4.3 and 49.4 μg/mL for seed extract and that for pericarp extract were 59.8 and 751.6 μg/mL respectively. Seed extract also showed very high reducing power (O.D. 1.14 at 50 μg/mL extract) and total antioxidant capacity (280.8 GAE or 310.24 AAE/g extract). In streptozotocin (STZ) induced type 2 diabetes rats, seed extract treated group showed serum glucose decreased from 13.75 ± 2.21 mmol/L (at 30 min) to 10.3 ± 1.75 mmol/L (at 135 min) and in the pericarp treated group …