Octyl gallate (Progallin O) is widely used as a food additive, with antimicrobial and antioxidant activity[2]. Octyl gallate (Progallin O) shows selective and sensitive fluorescent property[2]. Octyl gallate shows a marked antiviral effect against HSV-1, vesicular stomatitis virus (VSV) and poliovirus.In Vitro: Octyl gallate has antimicrobial activity over H. pylori, with a minimum inhibitory concentration (MIC) value of 125 μg/mL.