Objectives Normal weight obesity (NWO) is defined as a normal body weight according to Body Mass Index (BMI) but with a high body fat percentage. NWO is associated with metabolic abnormalities and cardiovascular risk factors, thereby emphasizing the importance of body fat loss. The objective of this study is to evaluate changes in weight and body fat with NWO who were prescribed Korean herbal medicine. Methods A retrospective chart review was conducted for subjects with NWO, within the normal weight range but with over 30% body fat percentage. These subjects were prescribed herbal medicine for a 12-week between March 2021 and May 2023. Weight (kg), body fat mass (kg), body fat percentage (%) and % Fat Free Mass (FFM) loss/weight loss (%FFML) were assessed before and after the period. Reported adverse events were evaluated for severity, causality, and system-organ classes. Results A total of 42 subjects were included (mean±SD, weight 57.38±3.45 kg, body fat percentage 33.65±2.12%). The average weight loss rate was 6.99±3.22% with a reduction of 4.08±1.95 kg, while the body fat loss rate averaged 18.00± 0.08% with a decrease of 3.54±1.73 kg. The average of %FFML was 21.89±0.16%. Most adverse events reported were mild (90.9%) in severity, and the likelihood of events being 'Unlikely' increased from 48.8% to 64.3% as the program progressed. Conclusions The administration of Korean herbal medicine can be considered an appropriate method to alleviate normal weight obesity, without causing serious adverse reactions. Further well-designed controlled trials and clinical studies with the analysis of hematological indicators are needed to validate its efficacy.