# Aged Garlic Extract (Kyolic / SAC) - Clinical Longevity Review & Consensus Audit

> **Consensus Verdict**: Aged Garlic Extract (AGE), manufactured via long-term ethanolic extraction (up to 20 months), converts unstable organosulfur compounds into bioactive, water-soluble S-allylcysteine (SAC) and S-allylmercaptocysteine (SAMC). Human randomized trials led by Budoff (2020) and Ried (2016) demonstrate that AGE (1200–2400 mg daily) significantly inhibits progression of coronary artery calcification, reduces vulnerable low-attenuation plaque (LAP) volume by 63% relative to placebo, lowers central blood pressure (-8 to -11 mmHg systolic), and decreases arterial pulse wave velocity.

## 1. Executive Summary & Scores
- **Longevity Evidence Score**: **89/100**
- **Evidence Quality Tier**: **silver**
- **Human Clinical Evidence Strength**: 90/100
- **Primary Longevity Classification**: supplements
- **Safety Margin Score**: 94/100 (Higher is safer)
- **Time Burden**: ~1 minutes/day
- **Estimated Monthly Cost**: inexpensive
- **Adherence Friction**: 1/10 (Lower is easier to sustain)

---

## 2. Biological Mechanisms of Action
SAC-mediated endothelial nitric oxide release & hydrogen sulfide gasotransmission

---

## 3. Canonical Longevity Vector Impacts (The 8 Longevity Pillars)
- **Heart Health & Endothelial Function**: **76/100** [Rank #43 of 133 in Heart] - Effect: Strong (-64% Coronary Low-Attenuation Soft Plaque Volume, -11.5 mmHg Systolic BP)
    - Mechanism: S-allylcysteine organosulfur compounds stimulate endothelial nitric oxide and hydrogen sulfide synthesis, halting and regressing necrotic low-attenuation coronary plaque progression.
- **Brain Longevity & Neuroprotection**: **48/100** [Rank #126 of 141 in Brain] - Effect: Moderate (Neurovascular microcirculation and hippocampal cytoprotection)
    - Mechanism: Preserves cerebral microvascular patency, scavenges peroxynitrite, and protects hippocampal neurons from glutamate excitotoxicity.
- **Metabolic Flexibility & Glycemic Control**: **50/100** [Rank #97 of 129 in Metabolic] - Effect: Moderate (Inhibits Advanced Glycation End-products [AGEs] and lipid peroxidation)
    - Mechanism: Acts as a dicarbonyl trap, inhibiting the chemical cross-linking of glucose with serum albumin and vascular basement membranes.
- **Cancer Defense & DNA Repair**: **25/100** [Rank #80 of 120 in Cancer Defense] - Effect: Mild (Organosulfur Phase II enzyme induction and apoptosis in dysplastic cells)
    - Mechanism: Modestly upregulates glutathione S-transferase and arrests cell-cycle progression in transformed gastrointestinal cells.
- **Endocrine & Anabolic Balance**: **0/100** [Rank #93 of 120 in Endocrine] - Effect: Neutral
    - Mechanism: Organosulfur botanical with neutral direct influence on Leydig cell steroidogenesis.
- **Chronic Inflammation Reduction**: **62/100** [Rank #99 of 126 in Inflammation] - Effect: Moderate-Strong (-22% hs-CRP, downregulates monocyte NF-κB and VCAM-1)
    - Mechanism: Suppresses IκBα phosphorylation in vascular endothelial cells and circulating monocytes, attenuating macrophage adhesion to the arterial intima.
- **Bone Density & Connective Matrix**: **0/100** [Rank #116 of 142 in Bone Matrix] - Effect: Neutral
    - Mechanism: No direct osteoblast mineralization or compressive bone loading action.
- **Cellular Longevity & Autophagy**: **52/100** [Rank #121 of 131 in Cellular] - Effect: Moderate (Endothelial telomere protection and lipid peroxyl quenching)
    - Mechanism: Prevents oxidative base lesions in vascular endothelial DNA and maintains physiological mitochondrial membrane potential.

---

## 4. Practical Protocol & Administration Guidelines
- **Standard Clinical Dosage**: 1,200 mg – 2,400 mg
- **Recommended Timing**: Morning & Evening with meals
- **Administration Type**: supplement
- **Recommended Biomarkers to Monitor**: heart_health, immune_resilience, bone_density, testosterone, cancer_defense, brain_longevity

---

## 5. Safety, Contraindications & Drug Interactions
- **Contraindications**: Active major hemorrhage or planned major surgery within 7–10 days
- **Safety Profile**: High - Occasional mild garlic body odor or mild gastrointestinal bloating in sensitive individuals

---

## 6. Peer-Reviewed Human Clinical Trials & Key PMIDs
1. **Aged Garlic Extract Reduces Low-Attenuation Plaque in Coronary Artery Disease: A Randomized Double-Blind Study** [PMID: 32029141]
   - Link: https://pubmed.ncbi.nlm.nih.gov/32029141/
2. **Aged garlic extract reduces low-attenuation plaque in coronary arteries** [PMID: 32010260]
   - Link: https://pubmed.ncbi.nlm.nih.gov/32010260/
3. **Supplementation with aged garlic extract improves human NK and gamma-delta T-cell function** [PMID: 22282313]
   - Link: https://pubmed.ncbi.nlm.nih.gov/22282313/
4. **The effect of aged garlic extract on blood pressure and arterial stiffness: the AGE at Heart trial** [PMID: 26867011]
   - Link: https://pubmed.ncbi.nlm.nih.gov/26867011/

---

## 7. Canonical Citation & Web Verification
- **Official Web Review**: [Aged Garlic Extract (Kyolic / SAC) on LongevityReviews](https://longevityreviews.org/modalities/aged-garlic-extract)
- **Last Evidence Calibration**: 2026-09-09
- **Review Policy**: 0% sponsored placements, independent peer-reviewed consensus.