This study aims to determine the effectiveness of the water fraction of caramunting leaves (Rhodomyrtus tomentosa (Ait.) Hassk). Against a decrease in blood glucose levels 2 hours post prandial and an increase in insulin levels of male white rats induced by streptozotocin. This research is an in vivo laboratory experimental research. The subjects of this study were 30 male white rats divided into 5 groups, namely positive control using glibenclamide, negative control using Na CMC, treatment group using caramunting leaf water fraction 70mg/ KgBB, 140mg/ KgBB, and 280mg / KgBB. The results showed that the caramunting leaf water fraction group was 70mg/ KgBB. 140mg/ KgBB, and 280m / KgBB effectively reduce blood glucose levels 2 hours post prandial and increase insulin levels. Based on the results obtained, it can be concluded that the water fraction of caramunting leaves (Rhodomyrtus tomentosa (Ait.) Hassk). Effectively reducing blood glucose levels 2 hours post prandial and increasing insulin levels with a dose of 280mg / KgBB is the most effective dose.

Summary Introduction: Karamunting (Rhodomyrtus tomentosa) is Indonesian native plant that contains high anti-oxidant compounds with the potential to suppress oxidative stress activity in cells. This study is the first research to specifically explore the role of the karamunting fraction in protecting kidney damage due to the formation of AGEs in the renal glomerulus in diabetes mellitus. Objective: This study aims to assess the impact of karamunting on blood glucose profile, HbA1c, insulin profile and kidney condition (AGEs expression, TNF-α and kidney histology) in diabetic rats. Methods: The karamunting extraction process was carried out by maceration with ethanol. Induction of diabetes mellitus was carried out using streptozotocin. Thirty male rats (Rattus norvegicus), Wistar strain weighing between 200–250 grams were the subject in this study. HbA1c, insulin, TNF-α, AGEs levels were evaluated in the kidney tissue. Histological assessment of the kidney was carried out. Results: Karamunting can improve blood glucose levels in diabetic rats. This improvement in blood glucose levels causes an improvement in the level of HbA1c. Administration of karamunting fraction can prevent AGEs deposition in renal tissue, which in turn will inhibits the inflammation and prevents further damage of kidneys. Conclusion: Karamunting fraction can improve blood glucose regulation so that it can prevent further damage and complications of kidney organs in diabetic rats.