The most common use for L-Tryptophan is in the treatment of depression. It is especially effective when combined with other medications. (L-Tryptophan naturally increases dopamine in neurotransmitters. Used alongside lithium, L-Tryptophan may potentially treat bipolar disorder. A recent study done on this chemical compound has suggested that it may aid in sleep, increase sleep quality and decrease sleep latency. When administered, L-Tryptophan can have immediate stress relieving effects in hypertensive patients. It may also cause a slight rise in blood pressure.