The free radical scavenging action of Magnolol and Honokiol in ethanol and ethanol-water, with DPPH·test comparing to rutin were studied.

Milk Thistle has a protective effect on the cell membrane which is mediated by a strong free radical scavenging and antioxidant action.

These results indicated that scavenging cytotoxic oxygen free radicals and increasing gastric mucus secretion might be one of the mechanisms of protective action of sm on the gastric mucosa.