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The anti-nephrototoxic activities of Polyphenol-rich fraction of methanolic extract of Hibiscus sabdariffa L.calyx was evaluated after its oral administration to STZ-induced diabetic Wistar rats.Diabetes Mellitus was induced in Wistar rats by a single i.p injection of 80 mg/kg b.w.STZ dissolved in 0.1 M citrate buffer (pH 6.3).