Synopsis

Source of validity: Scientific
Rating (out of 5): 3

L-tryptophan is an essential amino acid that serves as a biochemical precursor to serotonin, a neurotransmitter involved in regulating mood, sleep, and emotional stability. Scientific interest in L-tryptophan as a supplement for mood support originated in the 1970s and 1980s, as researchers discovered its role in serotonin synthesis. Several clinical studies have examined L-tryptophan supplementation for mood-related symptoms, particularly depression, premenstrual dysphoric disorder (PMDD), and mood swings associated with hormonal fluctuations. Some randomized controlled trials have shown that L-tryptophan can have a mild to moderate effect on improving mood and reducing irritability, especially in individuals with low baseline serotonin levels. Its efficacy is thought to stem from enhancing serotonin production in the brain, which can help stabilize mood swings and promote emotional balance. However, the quality and consistency of evidence vary, and some studies have found minimal or no benefit. Safety concerns also arose in the late 1980s due to contaminated batches causing eosinophilia-myalgia syndrome (EMS), but purified L-tryptophan is now considered safe when used appropriately. Overall, L-tryptophan is scientifically investigated and moderately supported for mood regulation, earning a rating of 3 out of 5 for evidence. It may be beneficial for some individuals, particularly those with serotonin-related mood disorders, but is not a first-line treatment compared to established therapies.

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Nature's Sunshine Free Amino Acids