The role of vitamin C to decrease organ dysfunction in sepsis was still controversial. This study aimed to explore the effect of intravenous (IV) vitamin C on urine NGAL (uNGAL) levels among septic patients in ICU. Methods This study was a randomized clinical trial held in Cipto Mangunkusumo Hospital from April to July 2019 with consecutive sampling method. Patients aged > 18 years with sepsis based on the criteria of sepsis-3 who were admitted to the ICU were included in this study. Exclusion

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... riteria were those with chronic kidney problems, with kidney stones, undergo renal replacement therapy in the ICU. All subjects were divided into: Group A was treated with combination of vitamin C and thiamine while Group B was given thiamine only. The uNGAL level was measured at baseline, 24, 48 and 72 h after treatment. Anova for repeated measurement using General Linear Model for Repeated Measurement was used with level of significant at p-value <0.05. Results Total of 33 subjects were included. In Group A we found uNGAL (ng/ mL) were 74.5 (13.3-102.9), 77.3 (15.2-98.4), 67.2 (22.6-100.6), 77.2 (17.0-100.5) for baseline, 24 h, 48 h, and 72 h respectively. While in Group B uNGAL were 57.7 (11.5-94.5), 57.1 (6.4-97.7), 53.7 (13.3-99.6), 47.6 (4.5-100.9). No significant difference in terms of uNGAL between two groups at each hour was found. Conclusions This study showed that intravenous vitamin C administration had no effect on uNGAL among septic patients. Need more study to investigate approaches to improve kidney and inflammatory biomarker among septic patients.