The effect of L-tryptophan supplementation and dietary instruction on chronic myofascial pain.

Effects of L-tryptophan supplementation and dietary manipulation were tested on patients with chronic myofascial pain around the temporomandibular joints. In this study, however, reduction of chronic pain reported in previous similar studies was not duplicated. No significant reduction in pain was noted in the groups receiving tryptophan and dietary manipulation compared with control groups.