# GHK-Cu SubQ (1.5–2.0 mg Daily) - Clinical Longevity Review & Consensus Audit

> **Consensus Verdict**: Rebuilds skin collagen, tightens skin elasticity, and supports hair follicle density from within.

## 1. Executive Summary & Scores
- **Longevity Evidence Score**: **85/100**
- **Evidence Quality Tier**: **silver**
- **Human Clinical Evidence Strength**: 71/100
- **Primary Longevity Classification**: peptides
- **Safety Margin Score**: 84/100 (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
Operates via multi-target metabolic, mitochondrial, and cellular homeostatic pathways.

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## 3. Canonical Longevity Vector Impacts (The 8 Longevity Pillars)
- **Cellular Longevity & Autophagy**: **82/100** [Rank #65 of 131 in Cellular] - Effect: Maintains genomic stability, telomeric integrity, extracellular collagen matrix, and mitochondrial proteostasis
    - Mechanism: Activates nuclear transcription factors (SIRT1/RAR), photobiomodulates cytochrome c oxidase, or enhances DNA strand break repair.

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## 4. Practical Protocol & Administration Guidelines
- **Standard Clinical Dosage**: 1.5 mg – 2.0 mg SubQ Daily (10 units from 50mg/2.5mL vial on U-100 syringe)
- **Recommended Timing**: Morning (or divided morning/evening)
- **Administration Type**: peptide_subq
- **Recommended Biomarkers to Monitor**: skin_clarity, joint_comfort, soreness, cellular_longevity

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## 5. Safety, Contraindications & Drug Interactions
- **Contraindications**: None reported in standard human trials with recommended doses.
- **Safety Profile**: High Margin - Well tolerated within physiological ranges.

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## 6. Peer-Reviewed Human Clinical Trials & Key PMIDs
1. **The human tripeptide GHK and tissue remodeling: gene expression modulation in skin and collagen synthesis** [PMID: 18644225]
   - Link: https://pubmed.ncbi.nlm.nih.gov/18644225/
2. **GHK-Cu peptide downregulates pro-inflammatory cytokines and promotes chondrocyte extracellular matrix production** [PMID: 26082814]
   - Link: https://pubmed.ncbi.nlm.nih.gov/26082814/
3. **Regenerative and Protective Actions of the GHK-Cu Peptide in the Light of the New Gene Data** [PMID: 29986520]
   - Link: https://pubmed.ncbi.nlm.nih.gov/29986520/
4. **NAD+ Intermediates and Longevity Therapeutics** [PMID: 30894380]
   - Link: https://pubmed.ncbi.nlm.nih.gov/30894380/
5. **Effect of copper peptide GHK-Cu on hair follicle enlargement and anagen growth** [PMID: 8326154]
   - Link: https://pubmed.ncbi.nlm.nih.gov/8326154/
6. **Copper peptide GHK-Cu in cosmetics: A randomized comparative clinical trial** [PMID: 16422478]
   - Link: https://pubmed.ncbi.nlm.nih.gov/16422478/
7. **Regenerative and Protective Actions of the GHK-Cu Peptide in the Light of the New Gene Data** [PMID: 26090430]
   - Link: https://pubmed.ncbi.nlm.nih.gov/26090430/

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## 7. Canonical Citation & Web Verification
- **Official Web Review**: [GHK-Cu SubQ (1.5–2.0 mg Daily) on LongevityReviews](https://longevityreviews.org/modalities/ghk-cu-subq)
- **Last Evidence Calibration**: 2026-08-18
- **Review Policy**: 0% sponsored placements, independent peer-reviewed consensus.