A total of 204-day-old chick Ross 308 was divided into three treatments, with four replicates containing 17 chicks each. The treatments were; T1 (control with no additive in drinking water), T2 (1 ml/L), T3 (2 ml/L) of I-boost compound in drinking water for three consecutive days per week from day-one to 35 days of age. All treatments were fed an ad-libitum commercial broiler diet. Measured parameters were broiler performance, Dressing percentage, Internal organs percentage, Jejunum histology (Villi height, Crypt depth, Villi width, Villi base width, Villi height/crypt depth, surface area), and Economic Efficiency. In the results, treatments including I-boost (1ml and 2 ml/L of drinking water) had significant effect (P<0.0001) on broiler performance (Body weight, Weight gain, Daily weight gain, and FCR) while had no effect on Feed and water intake, and live ability. Adding I-boost levels into drinking water had no effects on both dressing percentage and internal organs percentage compared to control group. Addition of I-boost into drinking water increased all the Jejunum histology parameters except crypt depth compared to control group. Among the treatments, addition of 2ml/L of I-boost had higher significant effect on most of the studied Jejunum parameters than 1ml/L and control group. However, T2 (1ml/L) had better economic efficiency compared to T3 and control groups. Overall, inclusions of herbal extract (I-Boost) have significant effect on broiler performance and gut morphology and improved the economic efficiency.