Beauty Sleep Ingredient

5-HTP
(5-Hydroxytryptophan)

The Serotonin Precursor — Bridging Mood, Sleep Quality, and the Hair Growth Cycle

5-HTP is a direct serotonin precursor that supports melatonin production, deep sleep quality, cortisol regulation, and the hormonal environment healthy hair follicles depend on.

60mg Per Serving
Sleep Support Pathway
Serotonin Direct Precursor
5-HTP (5-Hydroxytryptophan)
5H
5-HTP
5-Hydroxytryptophan · Serotonin Precursor
★ Serotonin Support
★ Sleep Architecture
★ Cortisol Regulation
Shop Beauty Sleep View The Research
5-HTP (5-Hydroxytryptophan)
5H
5-HTP
5-Hydroxytryptophan · Serotonin Precursor
★ Serotonin Support
★ Sleep Architecture
★ Cortisol Regulation

The Ingredient

What Is 5-HTP?

5-HTP sits upstream of the sleep-hair connection — supporting serotonin, melatonin, cortisol balance, and the deep sleep cycles follicles rely on for repair and growth.

5-HTP (5-hydroxytryptophan) is a naturally occurring amino acid and the direct metabolic precursor to serotonin in the brain.

Unlike tryptophan, which requires multiple conversion steps, 5-HTP crosses the blood-brain barrier efficiently and converts rapidly into serotonin.

Derived from the seeds of Griffonia simplicifolia, 5-HTP has been used clinically for decades in Europe to support mood, sleep quality, anxiety reduction, and stress regulation.

Its relevance to hair health operates through the serotonin → melatonin → hair follicle pathway. Higher serotonin availability allows for greater nighttime melatonin production, supporting deeper sleep cycles and healthier follicle regulation.

5-HTP also helps reduce stress-related cortisol elevation by restoring serotonin balance — important because elevated cortisol is one of the primary triggers of telogen effluvium and stress-related shedding.

Research further suggests that 5-HTP improves REM and deep slow-wave sleep — the stages during which growth hormone release and overnight follicle repair are most active.

Key Benefits

Direct Serotonin Precursor Crosses the blood-brain barrier efficiently and rapidly converts into serotonin.

Supports Melatonin Production Provides the serotonin required for nighttime melatonin synthesis and circadian regulation.

Helps Reduce Cortisol Supports stress resilience and may help interrupt the stress-shedding cycle linked to telogen effluvium.

Improves Sleep Architecture Supports REM and deep slow-wave sleep associated with growth hormone release and repair.

Supports Mood & Relaxation Clinically studied for mood balance, anxiety reduction, and sleep support.

Natural Plant-Derived Compound Derived from Griffonia simplicifolia as a non-pharmaceutical serotonin support ingredient.

Clinical Evidence

The Science: Clinical
Studies & Research

Research supports 5-HTP's role in serotonin production, melatonin synthesis, sleep architecture, stress reduction, and the hormonal environment that governs healthy hair growth.

STUDY 1

Sleep QualitySerotoninMelatonin

5-HTP Supplementation Improves Sleep Quality and Reduces Sleep Onset Time

Birdsall TC. · Alternative Medicine Review · 1998

5-HTP consistently improved sleep quality, sleep onset, and circadian rhythm regulation.

A comprehensive review found that 5-HTP improved sleep duration, sleep quality, anxiety reduction, and nighttime melatonin support through enhanced serotonin production.

View Study →, opens in a new tab

STUDY 2

Deep SleepGrowth HormoneSleep Architecture

5-HTP Increases REM Sleep and Deep Slow-Wave Sleep — The Stages Critical for Repair

Wyatt RJ, et al. · Psychopharmacologia · 1971

5-HTP significantly increased REM sleep and deep slow-wave sleep duration.

Clinical sleep architecture studies showed that 5-HTP improved the stages of sleep associated with highest growth hormone release and overnight cellular repair activity.

View Study →, opens in a new tab

STUDY 3

StressCortisolHair Shedding

Serotonin Depletion Elevates Cortisol and Drives Stress-Related Hair Shedding

Choi S, et al. · Nature · 2021

Elevated stress hormones suppress hair follicle stem cell activation and prolong the resting phase.

The Harvard stress-hair loss study established the molecular pathway connecting elevated cortisol to follicle suppression, supporting the relevance of serotonin-supporting interventions like 5-HTP.

View Study →, opens in a new tab

Shop

HAIRLOVE Products Containing
5-HTP

5-HTP is included in HAIRLOVE Beauty Sleep to support serotonin balance, deep restorative sleep, and stress-related hair health.

Front view of Beauty Sleep supplement bottle showcasing its pale pink label on a white background
SleepStress Support

Beauty Sleep

Contains 60mg 5-HTP alongside melatonin, magnesium, GABA, and calming sleep botanicals.

Front view of Growth Complex pouch, pink resealable bag with HAIRLOVE logo and 60 capsules
Hair GrowthNutrition

Growth Complex

Pairs with Beauty Sleep to support the nutritional and stress-related pathways involved in healthy hair growth.

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Editor's Note

5-HTP works upstream of the hair growth cycle by supporting serotonin and melatonin balance — which ultimately shapes sleep quality, cortisol regulation, and the follicle repair environment overnight.

All Beauty Sleep Ingredients

Melatonin L-Theanine Magnesium Vitamin B6 5-HTP GABA Herbal Sleep Complex