5-HTP — Mechanism, Benefits, Dosing

Overview

Direct serotonin precursor with mood and sleep applications.

Natural sources

Griffonia simplicifolia seeds

Common forms

5-HTP

Forms & variants of 5-HTP

Different chemical forms of 5-HTP behave differently. Browse each form's mechanism, bioavailability, and best-use context.

Mood protocol

5-HTP (Mood Dose)

Serotonin precursor used for mild depression and migraine.

Mechanism of action

Crosses BBB and is decarboxylated to serotonin (then to melatonin).

Pathways

· Serotonin & melatonin synthesis

Neurotransmitters

· Serotonin

Effects on the body

Increases

Serotonin

Decreases

Appetite

Organ system effects

Brain & CNS

May reduce migraine frequency.

Evidence-based benefits

Reduces depressive symptoms in small trials

Limited evidence

Reduces appetite/binge eating

Limited evidence

Potential side effects

Common

· Nausea
· Diarrhea

Rare

· Vivid dreams

Serious

· Serotonin syndrome with SSRIs

Drug interactions

SSRIs / SNRIs / MAOIs / tramadol

Serotonin syndrome.

severe

Safety & non-supplemental interactions

Educational summary — always confirm with your clinician or pharmacist before starting, stopping, or combining with prescription therapy.

Avoid if you are

·Pregnant or breastfeeding

Avoid with these conditions

·Down syndrome (seizure risk)
·Scleroderma

Avoid / monitor with these medications

·Alcohol, benzodiazepines, opioids, sedating antihistamines (additive CNS depression)
·SSRIs, SNRIs, MAOIs, tramadol, triptans, dextromethorphan (serotonin syndrome)
·Carbidopa

Before surgery

·Stop ≥2 weeks before surgery — serotonergic interaction with anesthesia.

Supplement interactions

Pairs well with

None listed.

Avoid combining with

Carbidopa absent
Peripheral conversion can cause GI issues.

Dosing & bioavailability

Typical dose

50–300 mg

Timing

Empty stomach or bedtime

Where to buy

Affiliate-style search links to reputable retailers. We don't endorse specific brands — verify third-party testing (USP, NSF, Informed Sport) before purchase.

Amino Acid

5-HTP

Amazon

Wide selection · fast shipping

Amino Acid

5-HTP

iHerb

Global delivery · curated brands

Amino Acid

5-HTP

Thorne

Practitioner-grade · NSF tested

Scientific evidence (9)

Systematic reviewExamine.com Supplement Database · 2023

5-HTP: pharmacology, clinical evidence, and safety — narrative review

Examine.com Research Team

Curated narrative review of human and preclinical evidence for 5-HTP, including mechanism, typical dosing, and safety considerations.

Key findings

Best-supported outcome: Reduces depressive symptoms in small trials (evidence: limited). Additional outcomes and limitations summarized in the full profile.

Open study

Systematic reviewPubMed (NLM) · 1970

PubMed: 5-HTP — Reduces depressive symptoms in small trials

Live PubMed search

Live results for "5-HTP Reduces depressive symptoms in small trials" across the PubMed/MEDLINE peer-reviewed index.

Key findings

Opens current human and preclinical literature matching 5-HTP and "Reduces depressive symptoms in small trials". Filter by RCT, meta-analysis, or year on the results page.

Open study

Systematic reviewPubMed (NLM) · 1970

PubMed: 5-HTP — Reduces appetite/binge eating

Live PubMed search

Live results for "5-HTP Reduces appetite/binge eating" across the PubMed/MEDLINE peer-reviewed index.

Key findings

Opens current human and preclinical literature matching 5-HTP and "Reduces appetite/binge eating". Filter by RCT, meta-analysis, or year on the results page.

Open study

Systematic reviewPubMed (NLM) · 1970

PubMed: 5-HTP — randomized controlled trial

Live PubMed search

Live results for "5-HTP randomized controlled trial" across the PubMed/MEDLINE peer-reviewed index.

Key findings

Opens current human and preclinical literature matching 5-HTP and "randomized controlled trial". Filter by RCT, meta-analysis, or year on the results page.

Open study

Systematic reviewPubMed (NLM) · 1970

PubMed: 5-HTP — meta-analysis

Live PubMed search

Live results for "5-HTP meta-analysis" across the PubMed/MEDLINE peer-reviewed index.

Key findings

Opens current human and preclinical literature matching 5-HTP and "meta-analysis". Filter by RCT, meta-analysis, or year on the results page.

Open study

Systematic reviewPubMed (NLM) · 1970

PubMed: 5-HTP — pharmacokinetics

Live PubMed search

Live results for "5-HTP pharmacokinetics" across the PubMed/MEDLINE peer-reviewed index.

Key findings

Opens current human and preclinical literature matching 5-HTP and "pharmacokinetics". Filter by RCT, meta-analysis, or year on the results page.

Open study

Systematic reviewPubMed (NLM) · 1970

PubMed: 5-HTP — safety adverse events

Live PubMed search

Live results for "5-HTP safety adverse events" across the PubMed/MEDLINE peer-reviewed index.

Key findings

Opens current human and preclinical literature matching 5-HTP and "safety adverse events". Filter by RCT, meta-analysis, or year on the results page.

Open study

Systematic reviewPubMed (NLM) · 1970

PubMed: 5-HTP — dose response

Live PubMed search

Live results for "5-HTP dose response" across the PubMed/MEDLINE peer-reviewed index.

Key findings

Opens current human and preclinical literature matching 5-HTP and "dose response". Filter by RCT, meta-analysis, or year on the results page.

Open study

Systematic reviewGoogle Scholar · 1970

Google Scholar: 5-HTP — clinical evidence

Live Scholar search

Cross-database citation index for 5-HTP as it relates to "clinical evidence".

Key findings

Includes preprints, theses, and journal articles. Useful for tracking citation counts and follow-on work.

Open study

Educational use only. This profile is not medical advice. Consult a qualified healthcare professional before starting any supplement, especially if you take prescription medication or have a chronic condition.