The purpose of this study is to learn more about if taking a supplement called
5-hydroxytryptophan (5HTP) can improve breathing and anxiety symptoms related to asthma. To
help learn more subjects will either be assigned to a group that is taking the supplement
(5HTP) or a group that is taking a placebo. This will be decided randomly. Later in the study
subjects will crossover to the other group.There are 5 study visits over the course of about
12 weeks.