Overview
Serotonin → melatonin precursor — supports sleep onset and depth.
- Dietary protein from animal sources (meat, fish, eggs, dairy) and plant sources (soy, legumes, grains)
- Free-form amino acid powders and capsules
- Targeted pre-workout, recovery, or sleep formulations
- Free-form crystalline powder
- Capsules or tablets
- Pre-mixed recovery or hydration beverages
- Time-release formulations
Mechanism of action
Crosses BBB and decarboxylates to serotonin → melatonin synthesis.
- · Crosses BBB
- · decarboxylates to serotonin → melatonin synthesis
Effects on the body
Organ system effects
Evidence-based benefits
Improves sleep onset; possible REM rebound
Limited evidencePotential side effects
- · Nausea
- · Serotonin syndrome with SSRIs/MAOIs
Drug interactions
Supplement interactions
- A high-quality multivitaminCovers micronutrient cofactors that support most supplement pathways.
- Omega-3 (EPA/DHA)Foundational anti-inflammatory support that complements most regimens.
No specific avoidances listed.
Dosing & bioavailability
Where to buy
Affiliate links — we may earn a commission at no extra cost to you. Amazon code supplementsch-20 is auto-applied at checkout. We don't endorse specific brands; verify third-party testing (USP, NSF, Informed Sport) before purchase.
Third-party testedIndependently verified 5-HTP (Sleep Use) — look for USP, NSF, or Informed Sport seals on the label for purity and dose accuracy.5-HTP (Sleep Use) third party tested NSF
CapsulesPre-measured 5-HTP (Sleep Use) capsules — easiest for travel and consistent daily dosing without scoops or scales.5-HTP (Sleep Use) capsules
PowderBulk unflavored 5-HTP (Sleep Use) powder — best cost-per-gram and flexible dosing for stacking or mixing into drinks.5-HTP (Sleep Use) powder unflavored
Best sellersMost-purchased 5-HTP (Sleep Use) products on Amazon — a quick way to see what's reviewed widely before you commit.5-HTP (Sleep Use) best sellerScientific evidence8Show studiesHide studies
5-HTP for sleep and mood
Shaw K, et al.
Cochrane review of 5-HTP in depression and sleep.
Modest benefits; better-quality trials needed.
PubMed: 5-HTP (Sleep Use) — Improves sleep onset; possible REM rebound
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PubMed: 5-HTP (Sleep Use) — randomized controlled trial
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PubMed: 5-HTP (Sleep Use) — meta-analysis
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PubMed: 5-HTP (Sleep Use) — pharmacokinetics
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PubMed: 5-HTP (Sleep Use) — dose response
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Google Scholar: 5-HTP (Sleep Use) — clinical evidence
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Includes preprints, theses, and journal articles. Useful for tracking citation counts and follow-on work.