The present invention provides a method of producing chicken essence powder, comprising hydrolyzing the chicken raw material by using the composite protease combining alkaline protease from Bacillus licheniformis with neutral protease from Bacillus subtilis, and spray drying a chicken essence concentration to obtain the chicken essence powder. In addition, the present invention also provides a chicken essence powder produced by the aforementioned method. The chicken essence powder has a particle size ranging from 50 μm to 100 μm, a molecular weight ranging from 200 Da to 2500 Da, and an amount of cholesterol less than 3 milligrams per 100 grams of chicken essence powder. In addition, the present invention also provides a method for scavenging α,α-diphenyl-β-picrylhydrazyl (DPPH) radical by administering the chicken essence powder to a host in need thereof.
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