Traditional herbal medicine is widely used among the Korean people, and other eastern Asian countries employ similar therapies as well. In recent years, due to increasing interest in herbal medicine, many researches have been made on the toxicity and adverse drug reactions of herbal medications. Through private and public media, there have been many opinions that taking herbal medicine is very harmful, especially, to liver and kidney. We face upon evaluation of herbal medication, safe, and efficacy. Furthermore, we need to control quality of herbs. This study aims to verify the evidence that taking herbal medicine will yield equal reaction in 2 lab animal groups (A and B). One frequently prescribed herbal medication, Yugmijihwangtang, was used to test the evaluation of quality on lab animals (SD-Rat). There were no significant differences in body, visceral weight, and serum analysis test results after herbal medication for 1 month. But, AST and ALT scores were raised in 2 subjects in group A (over reference range). It seems to be an adverse drug reaction, and this finding was restricted in group A herbal medicine. These results suggest that we need to qualify herbal plants in Korea, and study which herbs would cause specific reactions in human.