Horny Goat Weed for Health & Longevity - Quick Reference Sheet
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Horny Goat Weed for Health & Longevity

Created on 06/24/2026 – Quick Reference based on Evidence Review created using AI4L / Opus 4.8 – Audit

The most credible benefit is slowing bone loss in women past menopause, backed by one solid two-year study. Sexual-function and libido claims are biologically plausible but rest mainly on laboratory and animal work. Broader longevity effects remain speculative and limited by poor absorption. Liver-injury cases and heavy product contamination make sourcing the main concern. (Full Review)

Protocol

Standardized extract dosing
~60 mg icariin daily
Epimedium extract standardized to icariin; the landmark bone trial dose
Half-life and dosing frequency
Split doses across the day
Short half-life and poor absorption argue for split rather than single dosing
Co-administration to aid absorption
Take with food
Low bioavailability; with food or bioavailability-enhanced formulations
Time to effect
Bone outcomes
12–24 months
Continuous use before measurable changes in human evidence
Sexual function
Hours
More acute if present, but not well documented in humans

Benefits

Contraindications
  • Pregnant or breastfeeding women
  • Hormone-sensitive cancers or conditions
  • Significant liver disease (Child-Pugh Class B or C)
  • Cardiovascular instability or recent heart events (recent myocardial infarction within 90 days)
  • Nitrate therapy
  • Warfarin without supervision
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Key Interactions
  • Anticoagulant and antiplatelet drugs (warfarin, aspirin, clopidogrel)
  • Nitrates and blood-pressure-lowering drugs (nitroglycerin, isosorbide)
  • CYP3A4 substrates and modulators (statins, calcium-channel blockers, immunosuppressants)
  • Phosphodiesterase-5 inhibitors (sildenafil, tadalafil, vardenafil)
  • Hepatotoxic agents and alcohol
  • Other supplements with additive effects (L-arginine, L-citrulline, yohimbine, beetroot nitrate, soy isoflavones, red clover)
    •

Risk & Side Effects

  • High:
  • Medium: Liver injury
    •
  • Low: Cardiovascular and blood-pressure effects; gastrointestinal and general intolerance; estrogenic and hormone-sensitive effects
    •
  • Speculative: Mood changes and neuropsychiatric effects; product contamination harms
    •

Monitoring

Marker Target Why
ALT / AST (liver enzymes) ALT and AST roughly 10–26 U/L Detect early liver injury given the hepatotoxicity signal
Bilirubin <1.0 mg/dL Flags significant liver dysfunction
Blood pressure ~110–125 / 70–80 mmHg Capture the vessel-relaxing and adulterant-driven blood-pressure effects
Bone mineral density (DXA T-score) T-score above -1.0 Track the primary bone benefit for at-risk users
Bone-turnover markers (e.g., CTX, P1NP) Mid-to-low premenopausal reference for resorption markers Show whether bone resorption is being reduced
Estradiol Age-appropriate range Monitor the phytoestrogen activity in hormone-sensitive individuals

Cadence: Baseline, at roughly 4–8 weeks, then every 6–12 months for longer-term use; bone density reassessed no more than annually

Qualitative Assessment

  • Subjective sexual function and libido (for those using it for that purpose)
  • Energy levels and sense of vitality
  • Absence of side effects such as nausea, dizziness, or palpitations
  • Joint comfort and general musculoskeletal well-being
Not medical advice. Educational distillation of a single evidence review. Confirm any decision with a qualified clinician, especially in the presence of prescription drugs or chronic conditions.