But since protein blocks serotonin synthesis, eating a meal containing protein will actually cause both tryptophan and serotonin levels drop.
Elsewhere in Europe, it’s available as a prescription drug (8).
Unfortunately, this supplement’s usefulness for depression may be more hype than substance.
Several other brain-related disorders besides depression are related to low serotonin, including autism, ADHD, bipolar disorder, sleep disorders, and schizophrenia (3).
Many people with depression or other serotonin deficiency symptoms and conditions are searching for better ways to increase serotonin levels naturally without the use of drugs.
But SSRIs can have serious side effects and don’t work for everyone, possibly up to 40 percent of those who try them (1).