Understand the source comparison
Melatonin Peptide vs Melatonin: Research Application Comparison
Molecular Structure Indoleamine (C13H16N2O2), 232 g/mol Peptide chain (5–20 amino acids), 600–2000 g/mol Peptides allow structural modifications melatonin cannot support Half-Life 20–50 minutes 2–6 hours (depending on modifications) Peptides enable sustained r
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- Molecular Structure
- Indoleamine (C13H16N2O2), 232 g/mol
- Peptide chain (5–20 amino acids), 600–2000 g/mol
- Peptides allow structural modifications melatonin cannot support
- Half-Life
- 20–50 minutes
- 2–6 hours (depending on modifications)
- Peptides enable sustained receptor engagement without repeat dosing
- Receptor Selectivity
- Non-selective (MT1 ≈ MT2)
- Can be engineered for MT1 or MT2 selectivity
- Allows isolation of receptor-specific effects in mechanistic studies
- Bioavailability
- 15–30% oral (high first-pass metabolism)
- Variable (30–60% with cyclization or PEGylation)
- Peptides with enhanced stability reach higher effective concentrations
- Metabolic Pathway
- CYP1A2 hepatic metabolism → 6-hydroxymelatonin
- Peptidase degradation or renal clearance
- Peptides bypass CYP pathways, reducing drug-drug interaction risks
- Cost per Milligram
- $0.01–0.05 (bulk supplement)
- $15–50 (research-grade peptide)
- Peptides are laboratory reagents, not consumer supplements
- Primary Research Use
- Circadian entrainment, acute sleep induction
- Receptor selectivity studies, prolonged neuroprotection models
- Peptides answer mechanistic questions melatonin's broad activity obscures