Working alongside vitamin B6, niacin, and magnesium, Tryptophan is an essential amino acid that is used by the brain to produce serotonin. It helps induce natural sleep, reduces pain sensitivity, acts as a non-drug antidepressant, alleviates migraines, aids in reducing anxiety and tension, and aids in the control of alcoholism. Unfortunately, it is no longer available as an over-the-counter supplement and aside from a prescription must be consumed through naturally-occurring foods, such as cottage cheese, milk, meat, fish, turkey, bananas, dried dates, peanuts, and protein-rich foods. However, a similar supplement to Tryptophan is 5-HTP (or 5-hydroxytryptophan), but taking a complete complex B vitamin alongside it is recommended.
Source: Mindell, E. (2021). Dr. Earl Mindell’s Vitamin Bible. New York: Grand Central.