An experiment was conducted to determine the potential of using herbal methionine to replace DL-methionine as an essential amino acid supplement in broiler diets. Two hundred and forty (240) day-old commercial broiler chicks were randomly divided into four groups, each group consisted of 60 chicks. The birds of groups 1 and 2 were fed an DL-Methionine and Herbal Methionine respectively according to (NRC, 1994) requirements. While groups 3 and 4 DL-Methionine and Herbal Methionine were added at level of 50% more than (NRC, 1994) requirements. The results showed an improvement in the final body weight, feed intake and feed conversion ratio (FCR) in all groups when compared with the control group, Without any significant differences between groups. The HI-Ab titer of Newcastle disease virus was also did not differ significantly in all groups, inspite of the excess methionine. This study demonstrates that herbal methionine could replace DL-methionine efficiently when used in diets of commercial broiler chicken.