# Genistein (Soy Isoflavone Extract) - Clinical Longevity Review & Consensus Audit

> **Consensus Verdict**: Clinical trial evidence supporting bone mineral density retention and arterial flow-mediated dilation.

## 1. Executive Summary & Scores
- **Longevity Evidence Score**: **86/100**
- **Evidence Quality Tier**: **silver**
- **Human Clinical Evidence Strength**: 89/100
- **Primary Longevity Classification**: supplements
- **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
Selective ER-beta receptor agonism & tyrosine kinase enzyme inhibition

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## 3. Canonical Longevity Vector Impacts (The 8 Longevity Pillars)
- **Endocrine & Anabolic Balance**: **74/100** [Rank #16 of 120 in Endocrine] - Effect: Optimizes Leydig cell steroidogenesis and lowers SHBG binding affinity
    - Mechanism: Upregulates StAR transport protein activity in Leydig cells to stimulate steroidogenesis.

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## 4. Practical Protocol & Administration Guidelines
- **Standard Clinical Dosage**: 125 mg
- **Recommended Timing**: Dinner
- **Administration Type**: supplement
- **Recommended Biomarkers to Monitor**: bone_density, heart_health, testosterone

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## 5. Safety, Contraindications & Drug Interactions
- **Contraindications**: Estrogen-receptor positive breast/prostate malignancies
- **Safety Profile**: High - Safe dietary phytoestrogen; monitor in estrogen-sensitive oncological conditions.

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## 6. Peer-Reviewed Human Clinical Trials & Key PMIDs
1. **Genistein Aglycone Preserves Bone Mineral Density in Osteopenic Women** [PMID: 17616781]
   - Link: https://pubmed.ncbi.nlm.nih.gov/17616781/
2. **Tongkat Ali Effect on Androgen Profiles and Stress Resilience** [PMID: 23243449]
   - Link: https://pubmed.ncbi.nlm.nih.gov/23243449/
3. **Genistein Improves Endothelial Function and Arterial Elasticity** [PMID: 15531478]
   - Link: https://pubmed.ncbi.nlm.nih.gov/15531478/
4. **Effects of the Phytoestrogen Genistein on Bone Metabolism in Osteopenic Postmenopausal Women: A Randomized Controlled Trial** [PMID: 17589110]
   - Link: https://pubmed.ncbi.nlm.nih.gov/17589110/

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## 7. Canonical Citation & Web Verification
- **Official Web Review**: [Genistein (Soy Isoflavone Extract) on LongevityReviews](https://longevityreviews.org/modalities/genistein)
- **Last Evidence Calibration**: 2026-08-09
- **Review Policy**: 0% sponsored placements, independent peer-reviewed consensus.