When we talk of medicine, we tend to be more and more careful nowadays. It is due to the fact that a lot of people have mistakenly taken their medicines and have their diseases worsen. In fact, some mental disorders were found to be heightened by medicines itself.
In this site you will know the proper use of L-Tryptophan, the proper dosage, when to take it, and others.
Link: Iowa Clinic - USP DI Vol. II - L-TRYPTOPHAN (Systemic)