The objective of this study was to assess the efficacy and safety of standardized extract of rhizomes of Rhodiola rhodantha. In vitro antioxidant activity was investigated by DPPH radical scavenging activity, reducing power assay. A significant correlation existed between concentrations of the extract and percentage inhibition of free radicals and reducing power. In comparison to standard ascorbic acid the methanolic and chloroform extract of rhodanthus rhizome showed increased anti oxidant properties while the ethanolic extract showed remarkable improvement. These results clearly indicate that Rhodiola rhodantha is effective against free radical mediated diseases.
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