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  • This research aims to determine the effect red calliandra leaf extract on weight, anatomy andhistology of male mice liver. Treatment was administered orally with varying doses (2, 4, 6mg/ kg). Control grups was given 0,9% NaCl. This study used a completely randomizeddesign (CRD), consisting of 12 groups with three replications. Histological observationsshowed that red calliandra leaf extract significantly affected the damage of male mice liver.Damage level of nucleus pyknotic and fatty degeneration increased in line with the increasingdoses in treatment for 7 and 21 days, as well as the dilation of central venous in treatment for7 days. The damage increase in line with the leght of treatment in the fatty degeneration (dose2 mg/kg bw), nuclues pyknotic (doses 2 and 6 mg/kg bw), infiltration of inflammatory cells(dose 4 mg/kg bw), sinusoid congestion (doses 2, 4 and 6 mg/kg bw), and central venousdilatation (dose 2 and 4 mg/ kg bw).Keywords : Red calliandra, male mice, liver histology