# Melatonin - Clinical Longevity Review & Consensus Audit

> **Consensus Verdict**: Melatonin helps you fall asleep faster and enjoy higher quality sleep tonight. This foundational sleep improvement also supports long-term health by acting as a powerful antioxidant that protects your mitochondria and cells from age-related damage.

## 1. Executive Summary & Scores
- **Longevity Evidence Score**: **91/100**
- **Evidence Quality Tier**: **silver**
- **Human Clinical Evidence Strength**: 94/100
- **Primary Longevity Classification**: supplements
- **Safety Margin Score**: 92/100 (Higher is safer)
- **Time Burden**: ~15 minutes/day
- **Estimated Monthly Cost**: inexpensive
- **Adherence Friction**: 3/10 (Lower is easier to sustain)

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## 2. Biological Mechanisms of Action
Acts as a potent mitochondrial antioxidant and circadian rhythm anchor.

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## 3. Canonical Longevity Vector Impacts (The 8 Longevity Pillars)
- **Brain Longevity & Neuroprotection**: **72/100** [Rank #65 of 141 in Brain] - Effect: Preserves neural synaptic density and neurotrophic signaling
    - Mechanism: Supports glymphatic neuro-clearance and attenuates neuro-inflammatory signaling.

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## 4. Practical Protocol & Administration Guidelines
- **Standard Clinical Dosage**: 0.3 - 3.0mg
- **Recommended Timing**: 30m before bed
- **Administration Type**: supplement
- **Recommended Biomarkers to Monitor**: sleep_quality, cellular_longevity, sleep_latency, brain_longevity, waking_restedness

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## 5. Safety, Contraindications & Drug Interactions
- **Contraindications**: 
- **Safety Profile**: low_risk - Well tolerated within physiological ranges.

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## 6. Peer-Reviewed Human Clinical Trials & Key PMIDs
1. **Meta-analysis: melatonin for the treatment of primary sleep disorders** [PMID: 23691095]
   - Link: https://pubmed.ncbi.nlm.nih.gov/23691095/
2. **Neuroprotective and Cognitive Longevity Mechanisms** [PMID: 30268595]
   - Link: https://pubmed.ncbi.nlm.nih.gov/30268595/
3. **Efficacy of prolonged-release melatonin in insomnia patients aged 55-80 years: quality of sleep and next-day alertness outcomes** [PMID: 17875249]
   - Link: https://pubmed.ncbi.nlm.nih.gov/17875249/

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## 7. Canonical Citation & Web Verification
- **Official Web Review**: [Melatonin on LongevityReviews](https://longevityreviews.org/modalities/melatonin)
- **Last Evidence Calibration**: 2026-07-30
- **Review Policy**: 0% sponsored placements, independent peer-reviewed consensus.