Clinical Studies on 5-HTP

5-HTP (5-Hydroxytryptophan)

5-HTP is a naturally occurring compound and direct precursor to serotonin, a neurotransmitter involved in normal mood regulation, appetite control, and sleep-wake cycles.*

Summary of Research on 5-HTP 

Research has explored 5-HTP's role in supporting normal serotonin production and related physiological processes. Key areas of study include:

General Absorption and Serotonin Support

• Studies indicate that oral 5-HTP is well-absorbed (approximately 70% bioavailability), crosses the blood-brain barrier, and supports normal central nervous system serotonin synthesis, which plays a role in everyday mood balance, appetite regulation, and sleep patterns.* 

• Link: 5-Hydroxytryptophan: a clinically-effective serotonin precursor (Birdsall, 1998)

Relaxation and Stress Response

• Some research has assessed 5-HTP in models of everyday stress or challenge responses, noting support for normal relaxation and adaptive responses.*

• Examples include studies using controlled challenges to evaluate subjective calm and related markers.* 

• Links:

• The effect of 5-hydroxytryptophan on cholecystokinin-4-induced panic attacks in healthy volunteers (Maron et al., 2004)

• Acute L-5-hydroxytryptophan administration inhibits carbon dioxide-induced panic in panic disorder patients (Schruers et al., 2002)

• Effect of a serotonin precursor and uptake inhibitor in anxiety disorders; a double-blind comparison of 5-hydroxytryptophan, clomipramine and placebo (Khan et al., 1987)

• L-5-Hydroxytryptophan in the treatment of anxiety disorders (Khan, Westenburg, 1985)

Mood and Emotional Balance

• Clinical investigations have examined 5-HTP's effects on normal mood pathways in healthy adults or those with everyday challenges, showing potential support for emotional well-being.*

• Examples include comparisons to placebo in controlled settings, with observations of mood-related outcomes.* 

• Links:

• Efficacy and safety of 5‐hydroxytryptophan on depression and apathy in Parkinson's disease: a preliminary finding (Meloni et al., 2020)

• Comparative study of efficacy of l-5-hydroxytryptophan and fluoxetine in patients presenting with first depressive episode (Jangid et al., 2013)

• Primary fibromyalgia syndrome and 5-hydroxy-L-tryptophan: a 90-day open study (Puttini, Caruso, 1992)

• Double-blind study of 5-hydroxytryptophan versus placebo in the treatment of primary fibromyalgia syndrome (Caruso et al., 1990)

• Treatment of depression with L-5-hydroxytryptophan combined with chlorimipramine, a double-blind study (Nardini et al., 1983)

• Clinical evaluation of 5-hydroxy-L-tryptophan as an antidepressant drug (Nakajima et al., 1978)

• 5-Hydroxytryptophan (5-HTP) and a MAOI (nialamide) in the treatment of depressions. A double-blind controlled study (Aliño et al., 1976)

• L‐5‐Hydroxytryptophan‐(L‐5‐HTP) Therapie* - SANO - 1972 - Psychiatry and Clinical Neurosciences (von Sano, 1972)

Sleep Quality

• Investigations have looked at 5-HTP's influence on normal sleep architecture and restful patterns, including REM sleep percentages and overall sleep measures in healthy subjects or those with occasional sleep disruptions.*

• Examples include trials showing effects on sleep latency, quality, and architecture.* 

• Links:

• The impact of 5-hydroxytryptophan supplementation on sleep quality and gut microbiota composition in older adults: A randomized controlled trial (Sutanto et al., 2024)

• Preliminary finding of a randomized, double-blind, placebo-controlled, crossover study to evaluate the safety and efficacy of 5-hydroxytryptophan on REM sleep behavior disorder in Parkinson's disease (Meloni et al., 2022)

• The Impact of 5-Hydroxytryptophan Supplementation on Sleep Quality of Older Adults in Singapore: A Randomized Controlled Trial (Sutanto et al., 2021)

• Headache in association with sleep disorders in children: a psychodiagnostic evaluation and controlled clinical study--L-5-HTP versus placebo (De Giorgis et al., 1987)

• Effects of 5-hydroxytryptophan on the sleep of normal human subjects (Wyatt et al., 1971)

*These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease. The summaries above reference general research on 5-HTP and do not represent specific claims about NeuroVital Serenity. Consult a healthcare professional before use, and see full studies for details.