PGBx is a mixture of oligomers of PGB1 with a molecular weight of 1,000-1,500. It has antioxidant and free radical trapping activity that was first studied in isolated mitochondria.{477} PGBx has anti-inflammatory and cytoprotective activity which may be attributed to inhibition of the 14 kDa sPLA2.{414,1188} At a dose of 1 mg/kg, PGBx significantly reduces the incidence of ulcers in rats.{414}