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5-HTP

serotonin precursor, mood and sleep support

Evidence · Grade CSafety · Use with caution
Traditional useSafety cautionInteraction risk

Serotonin precursor sometimes used for sleep and mood.

Last reviewed June 5, 2026 · AI-assisted, human-reviewed
5-HTP (5-hydroxytryptophan) is a naturally occurring amino acid that serves as a precursor to the neurotransmitter serotonin. Serotonin plays a crucial role in regulating mood, sleep, appetite, and pain sensation. Because 5-HTP can cross the blood-brain barrier and be converted into serotonin, it has been explored for its potential to influence these physiological processes. It is commonly derived from the seeds of the African plant Griffonia simplicifolia. While 5-HTP is available as a dietary supplement, the scientific evidence supporting its efficacy for various conditions is still developing. It is often investigated for conditions associated with serotonin imbalance, such as mood disorders and sleep disturbances. However, without specific studies provided, it's important to note that claims about its benefits are largely based on its biochemical role rather than robust clinical trial data.

Quick answer

What it is: 5-HTP (5-hydroxytryptophan) is a naturally occurring amino acid that serves as a precursor to the neurotransmitter serotonin.

May support:Migraine, Insomnia, Seasonal Affective Disorder, Obesity, Anxiety Disorder, Depression, Fibromyalgia

Evidence:Evidence · Grade C

Safety:Safety · Use with caution

Evidence Summary

Evidence · Grade C

The current understanding of 5-HTP's potential benefits is primarily based on its known biochemical role as a serotonin precursor. While this biochemical pathway is well-established, direct clinical evidence from randomized controlled trials specifically for its efficacy in conditions like insomnia, seasonal affective disorder, or depression is not provided. Therefore, any claims about its effectiveness are theoretical or anecdotal without specific study citations.

Last reviewed · Jun 2026

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Why It Works

5-HTP is converted into serotonin in the brain. Serotonin is a neurotransmitter that influences mood, sleep, appetite, and other functions.

How it works in more detail

5-HTP is an intermediate metabolite in the biosynthesis of serotonin (5-hydroxytryptamine, 5-HT) from the essential amino acid L-tryptophan. Unlike tryptophan, 5-HTP can readily cross the blood-brain barrier without competition from other amino acids. Once in the brain, 5-HTP is decarboxylated by the enzyme aromatic L-amino acid decarboxylase (AADC) into serotonin. This direct conversion increases serotonin levels in the central nervous system, which is thought to be the primary mechanism by which 5-HTP exerts its potential effects on mood, sleep, and other serotonin-mediated processes.

How to use

Always consult a qualified clinician.

Editorial guidance

Suggested dosage
Commonly, consumers may take 50-200 mg of 5-HTP in capsule form, often divided into multiple doses. It is typically advised to start with a lower dose and gradually increase.
Research dosage range
No specific research dosage range can be provided without PubMed studies.
Typical onset
Effects may be noticed within a few days to several weeks, depending on the individual and the condition being addressed.
Typical forms
capsule, tablet
Quality markers
Look for products standardized to contain a specific amount of 5-HTP, often derived from Griffonia simplicifolia seeds. Third-party testing for purity and absence of contaminants is also a good indicator of quality.
Medication interactions
  • Antidepressants (SSRIs, MAOIs, tricyclics)
  • Carbidopa
  • Dextromethorphan
  • Triptans
  • Tramadol
  • Sedatives (CNS depressants)
Avoid if
  • Pregnant or breastfeeding
  • Taking SSRIs or other serotonergic drugs
  • Have scleroderma (due to theoretical link to eosinophilia-myalgia syndrome)

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Suggested dosage

Commonly, consumers may take 50-200 mg of 5-HTP in capsule form, often divided into multiple doses. It is typically advised to start with a lower dose and gradually increase.

General guidance — discuss specifics with a clinician.

Active medicinal compounds

5-hydroxytryptophan (5-HTP)

Traditional use

While 5-HTP itself is a biochemical compound, the plant from which it is often derived, Griffonia simplicifolia, has been used in traditional African medicine for various purposes, including as an aphrodisiac, an antibiotic, and for wound healing. However, its traditional use is not directly linked to its 5-HTP content for mood or sleep.

Safety

Safety warnings

Consult a healthcare professional before taking 5-HTP, especially if you are pregnant, breastfeeding, have a medical condition, or are taking medications. There is a theoretical risk of serotonin syndrome when combined with other serotonergic agents. Long-term safety data are limited.

Avoid if

  • Pregnant or breastfeeding
  • Taking SSRIs or other serotonergic drugs
  • Have scleroderma (due to theoretical link to eosinophilia-myalgia syndrome)

Medication interactions

  • Antidepressants (SSRIs, MAOIs, tricyclics)
  • Carbidopa
  • Dextromethorphan
  • Triptans
  • Tramadol
  • Sedatives (CNS depressants)

Reported side effects

  • Nausea
  • Diarrhea
  • Stomach cramps
  • Vomiting
  • Drowsiness
  • Muscle problems

General guidance — discuss specifics with a clinician.

Evidence ecosystem

Scientific literature, clinical guidance, government sources, ongoing research, traditional use, and lived experience — grouped by source type and quality.

No indexed evidence yet. We're still building out this remedy's evidence ecosystem.

Limitations: A significant limitation is the absence of specific PubMed studies to support claims for particular ailments. Without clinical trial data, it is difficult to assess efficacy, optimal dosages, or potential side effects in a rigorous, evidence-based manner. The current understanding relies heavily on the known metabolic pathway of 5-HTP to serotonin, rather than direct human intervention studies.

This page is educational. Statements use phrases like "may support" and "has been studied for"because no remedy here is approved to cure, treat, or reverse any condition. Discussion happens on the ailment pages — community statistics here are derived from those reports. Always consult a qualified clinician.

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