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Percentage remaining activity of (a) CYP2C8 and (b) CYP3A4 after 30 min co-incubation with ASP (aspalathin), GRT (unfermented rooibos extract) and FRE (fermented rooibos extract) with NADPH and substrates. Data are the average values of two independent assays done in duplicate (n = 4).
