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The stacked UHPLC-CAD chromatograms of the GSE-1 extract, the extracted authentic grape seed (Vitis vinifera) material, the extracted authentic peanut skin (Arachis sp.) material (green trace), and the extracted authentic pine skin (Piunus pinaster) material (blue trace). The GSE-1 and authentic grape seed extracts were in agreement. There were no indications of adulteration in the GSE-1 extract when compared to the peanut skin and pine bark traces.
