Provided is a composition and a pharmaceutical composition for reducing topical fat or promoting weight loss, wherein the composition comprises a plant extract composition comprising resveratrol and turmeric extract and a weight ratio of resveratrol and turmeric extract ranges from 1:30 to 10:1. The composition and the pharmaceutical composition are primarily administered through topical injection to inhibit the growth of fat cells and promote fat cells apoptosis to reduce adipocytes, decrease topical fat deposition, and promote weight loss, without causing inflammation or necrosis on peripheral cells or tissues to avoid severe pain, so as to avoid inflammation, damage, and pain caused by surgical liposuction or non-surgical lipolysis products such as phosphatidylcholine and sodium deoxycholate.
