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5-HTP (5-Hydroxytryptophan, L-5-Hydroxytryptophan)

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Related terms
Background
Evidencetable
Tradition
Dosing
Safety
Attribution

Related Terms
  • 5-Hydroxytroptophan, Griffonia plant seed extract, Griffonia simplicifolia, L-5-HTP, L-5-hydroxytroptophan, Natrol® 5-HTP, Natural Factors® 5-HTP, oxitriptan, serotonin, Tript-OH®, tryptophan.
  • Select combination products: GabadoneT (5-HTP, tryptophan, and other amino acids), Nature's Way 5-HTP (5-HTP, vitamin B6, vitamin C), Natural Factors® Tranquil Sleep (5-HTP, melatonin, L-theanine).
  • Note: 5-HTP should not to be confused with L-tryptophan.

Background
  • 5-HTP is the precursor of the neurotransmitter serotonin. Commercially available 5-HTP is obtained from the seeds of the plant Griffonia simplicifolia.
  • 5-HTP has been suggested as a treatment for many conditions. Some research supports the use of 5-HTP in treating cerebellar ataxia, headache, depression, psychiatric disorders, and fibromyalgia, and as an appetite suppressant or weight loss agent. There is insufficient scientific evidence to support the use of 5-HTP for any other medical condition.
  • 5-HTP may cause gastrointestinal disturbances, mood disturbances, seizure, or abnormal blood counts. Some side effects might result from contaminants in 5-HTP products.

Evidence Table

These uses have been tested in humans or animals. Safety and effectiveness have not always been proven. Some of these conditions are potentially serious, and should be evaluated by a qualified healthcare provider. GRADE *


5-HTP has been observed to have benefits in some people who have difficulty standing or walking because of cerebellar ataxia. However, current evidence is mixed.

B


Studies suggest that 5-HTP may reduce eating behaviors, lessen caloric intake, and promote weight loss in obese individuals.

B


Early research suggests that 5-HTP may lessen alcohol withdrawal symptoms. Further research is needed before a conclusion can be made.

C


Although 5-HTP has been proposed as a possible treatment for anxiety disorders, sufficient human evidence to make a firm conclusion is lacking.

C


The results of numerous studies in humans suggest that 5-HTP may aid in the treatment of depression. However, it is not known whether 5-HTP is as effective as commonly prescribed antidepressant drugs.

C


Preliminary research on 5-HTP in children with Down's syndrome has yielded insignificant results. Further research is necessary.

C


There is a small amount of research evaluating the use of 5-HTP for fibromyalgia. Early evidence suggests that 5-HTP may reduce the number of tender points, anxiety, and the intensity of pain, and may improve sleep, fatigue, and morning stiffness. Further research is needed before a conclusion can be made.

C


Several studies, in both children and adults, suggest that 5-HTP may be effective in reducing the severity and frequency of headaches, including tension headaches and migraines. Further research is needed.

C


In early research, 5-HTP lacked an effect on mood in healthy, young subjects. However, in this population, 5-HTP may impair decision-making. Further well-designed research is needed.

C


5-HTP has been studied in panic disorder and various neurologic disorders. Additional clinical research is needed before conclusions can be made.

C


Parkinson's disease is a neurological disorder that usually develops around the age of 50. The disorder occurs when the brain cells that make dopamine slowly degenerate. Symptoms include tremors (shaking) and difficulties with movement and coordination. 5-HTP has been studied, usually in combination with drugs, for Parkinson's disease.

C


It has been suggested that 5-HTP may reduce psychotic symptoms and mania in panic disorder, but studies in people with schizophrenia have shown mixed results.

C


Insufficient evidence is currently available regarding the use of 5-HTP for sleep disorders. Additional studies are needed before a conclusion can be drawn.

C


Limited research suggests that 5-HTP may be ineffective for reducing hot flash frequency in postmenopausal women. Further research is required before firm conclusions can be drawn.

D


Although 5-HTP has been studied as a treatment for various myoclonic syndromes and epilepsy, available research does not support the use of 5-HTP for these conditions.

D
* Key to grades

A: Strong scientific evidence for this use
B: Good scientific evidence for this use
C: Unclear scientific evidence for this use
D: Fair scientific evidence for this use (it may not work)
F: Strong scientific evidence against this use (it likley does not work)


Tradition / Theory

The below uses are based on tradition, scientific theories, or limited research. They often have not been thoroughly tested in humans, and safety and effectiveness have not always been proven. Some of these conditions are potentially serious, and should be evaluated by a qualified healthcare provider. There may be other proposed uses that are not listed below.

  • Aggression, agoraphobia, Alzheimer's disease, amyotrophic lateral sclerosis (ALS), anorexia, antioxidant, appetite suppressant, attention-deficit hyperactivity disorder (ADHD), autism, bulimia nervosa, cough, deficiency (aromatic L-amino acid decarboxylase deficiency, serotonin deficiency), delirium tremens (DTs), diabetes, digestion, dizziness, dystonia (muscle contraction disorder), eating disorders (binge eating), endocrine disorders (Cushing's syndrome, hypothalamic syndrome), eye disorders (ophthalmoplegia), gastroesophageal reflux disease (GERD), gynecological disorders (premenstrual dysphoria), hepatitis, herpes virus infection (Ramsay Hunt syndrome), hormonal disorders, inflammation, melatonin deficiency, migraines, mood disorder, myoclonic disorders (Lance-Adams syndrome), pain, phenylketonuria, premenstrual syndrome, psychosis (LSD-induced), relaxation, restless leg syndrome, seasonal affective disorder, sexual dysfunction, stress, temperature regulation.

Dosing

Adults (18 years and older)

  • For cerebellar ataxia, 10-16 milligrams per kilogram of body weight has been taken by mouth daily.
  • For depression, 200-300 milligrams has been taken by mouth daily.
  • For fibromyalgia, 100 milligrams has been taken by mouth three times daily.
  • For headache, 300-600 milligrams has been taken by mouth daily in divided doses.
  • For hot flashes, 150 milligrams has been taken by mouth daily for four weeks.
  • For mood, 50 milligrams has been taken by mouth in two separate doses.
  • For obesity, eight milligrams per kilogram of body weight or 750-900 milligrams has been taken by mouth daily.
  • For psychiatric disorders, 25-350 milligrams has been taken by mouth daily for anxiety.
  • For seizures or epilepsy (myoclonic disorders), 15 milligrams per kilogram of body weight has been taken by mouth daily, in combination with carbidopa, for 14 days to one month.
  • For sleep disorders, 100 milligrams has been taken by mouth at 7:30 p.m., followed by 200 milligrams at 9:00 p.m. for five nights.

Children (younger than 18 years)

  • 5-HTP may be unsafe in this population, due to potential side effects.
  • For Down syndrome, newborns have been given two milligrams per kilogram of body weight by mouth daily.
  • For headache, up to 150 milligrams has been taken by mouth daily for 12 weeks.
  • For sleep disorders, infants with Down syndrome have been given varying doses (based on age and tolerance) for 12-36 months. Schizophrenic boys (aged seven and nine years) have been given three milligrams per kilogram of body weight by mouth for eight days.

Safety

The U.S. Food and Drug Administration does not strictly regulate herbs and supplements. There is no guarantee of strength, purity or safety of products, and effects may vary. You should always read product labels. If you have a medical condition, or are taking other drugs, herbs, or supplements, you should speak with a qualified healthcare provider before starting a new therapy. Consult a healthcare provider immediately if you experience side effects.

Allergies

  • Avoid in individuals with a known allergy or hypersensitivity to 5-HTP. Signs of allergy may include rash, itching, or shortness of breath.

Side Effects and Warnings

  • In light of the concern related to eosinophilia myalgia syndrome (EMS), use of 5-HTP should be supervised by a qualified healthcare provider.
  • 5-HTP may cause abdominal pain, absence of menstrual bleeding, agitation, aggressiveness, anorexia, anxiety, depressed mood, diarrhea, dizziness, drowsiness, ear buzzing, eosinophilia, eosinophilia myalgia syndrome (EMS), euphoria, fatigue, gas, gastrointestinal side effects, hand wringing, headache, heartburn, hives, hypomania, impaired decision-making, increased appetite, increased blood cortisol or kynurenine, irritability, loss of inhibition, lowered blood pressure, lowered cholesterol, mania, muscle pain or weakness or breakdown, nausea, pacing, palpitations, psychic hyperkinetic syndrome, rapid speech, restlessness, seizure, scleroderma-like symptoms, sleep changes, slowed heart rate, sodium retention, strong muscle contractions, sweating, taste changes, vertigo, vivid dreams, vomiting, or weight gain.
  • Use cautiously in patients with existing gastrointestinal disorders, as 5-HTP may cause worsening of symptoms.
  • Use cautiously in patients with schizophrenia, due to the potential for worsening symptoms.
  • Use cautiously in patients with HIV/AIDS, particularly HIV-1 infection.
  • Use cautiously in patients with seizure disorders or those using agents that may lower the seizure threshold, due to increased risk of seizures.
  • Use cautiously in patients with a history of mental disorders.
  • Use cautiously in patients using CNS depressants. Drowsiness or sedation may occur. Use caution if driving or operating heavy machinery.
  • Use cautiously in patients taking decarboxylase inhibitors.
  • 5-HTP may cause low blood pressure. Caution is advised in patients taking drugs, herbs, or supplements that lower blood pressure.
  • Use cautiously in patients with bradycardia (slow heart rate).
  • Avoid in patients with eosinophilia syndromes, due to cases of eosinophilia and eosinophilia-myalgia syndrome (EMS).
  • Avoid in infants with Down syndrome, due to the potential for spasm.
  • Avoid in patients with mitochondrial encephalomyopathy.
  • Avoid in patients with suicidal thoughts, based on suicide attempts following 5-HTP use.
  • Avoid use in individuals using "party pills" (benzylpiperazine and trifluoromethylphenylpiperazine), based on population studies suggesting that the combination is associated with increased adverse effects from the party pills.
  • Avoid in patients taking antidepressant medications (tricyclics [TCAs], monoamine oxidase inhibitors [MAOIs], selective serotonin reuptake inhibitors [SSRIs], nefazodone, trazodone, venlafaxine, mirtazapine, or bupropion) or any other medications that may affect serotonin, due to potential increases in serotonin levels and increased risk of serotonin toxicity syndrome.
  • Avoid in women who are pregnant or lactating, due to a lack of safety data.
  • Avoid in patients with a known allergy to 5-HTP-containing products. Signs of allergy to 5-HTP may include rash, itching, or shortness of breath.

Pregnancy and Breastfeeding

  • Avoid in pregnant or breastfeeding women, due to a lack of available scientific evidence. 5-HTP products may contain contaminants or increase levels of prolactin, a hormone needed for milk production.

Attribution
  • This information is based on a systematic review of scientific literature edited and peer-reviewed by contributors to the Natural Standard Research Collaboration (www.naturalstandard.com).

Copyright © 2011 Natural Standard (www.naturalstandard.com)


The information in this monograph is intended for informational purposes only, and is meant to help users better understand health concerns. Information is based on review of scientific research data, historical practice patterns, and clinical experience. This information should not be interpreted as specific medical advice. Users should consult with a qualified healthcare provider for specific questions regarding therapies, diagnosis and/or health conditions, prior to making therapeutic decisions.

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