Herbal Extract
Epimedium brevicornum Extract (Leaf) - 10% Icariin
Also known as: Horny Goat Weed, Epimedium, Yin Yang Huo, Icariin
A traditional Chinese herb extract standardized to 10% icariin, a prenylated flavonol compound used for sexual function and vascular health. Icariin acts as a phosphodiesterase-5 (PDE-5) inhibitor.
Last reviewed June 2026 · Evidence graded from peer-reviewed research, not editorial opinion. Educational only — not medical advice.
Every Epimedium brevicornum Extract (Leaf) - 10% Icariin product we have scored
| # | Product | Score | Per serving |
|---|---|---|---|
| 1 | Nootropics Depot Eurycomax Capsules | 86 A- | $2.17 |
| 2 | Nutricost Horny Goat Weed Capsules | 86 A- | $0.09 |
| 3 | Double Wood Horny Goat Weed Supplement | 86 A- | $0.44 |
| 4 | Micro Ingredients Organic Horny Goat Weed Powder | 85 A- | $0.29 |
| 5 | Nutricost Testosterone Complex Capsules | 84 A- | $0.57 |
| 6 | NOW Foods Testo Jack 200 | 83 A- | $0.57 |
| 7 | NOW Foods Horny Goat Weed Extract | 80 A- | $0.18 |
Scored on dose accuracy, form, label transparency and third-party testing. Per-serving cost is list price divided by servings per container. No brand pays to be listed or ranked.
Common questions
How much Epimedium brevicornum Extract (Leaf) - 10% Icariin should I take?
The typical range is 500-1000 mg daily of 10% icariin extract (providing ~50-100 mg icariin). Acute effects noted within 1-2 hours; chronic benefits develop over 2-4 weeks of daily use
When should I take Epimedium brevicornum Extract (Leaf) - 10% Icariin?
Typically taken 30-60 minutes before sexual activity, or daily for chronic use. May take with or without food; fatty meals may enhance absorption.
Which form of Epimedium brevicornum Extract (Leaf) - 10% Icariin is best?
Extract. Other forms in the catalog: Capsule.
Is Epimedium brevicornum Extract (Leaf) - 10% Icariin safe?
Commonly reported: Flushing, Headache, Mild digestive upset, Dizziness.
Which Epimedium brevicornum Extract (Leaf) - 10% Icariin supplement scores highest?
Nootropics Depot Eurycomax Capsules, at 86/100. Scored on dose accuracy, form, label transparency and third-party testing — no brand pays to be listed or ranked.
Primary uses
- Sexual function and erectile quality
- Vascular endothelial function
- Bone health
- Energy and stamina
How it works
- PDE-5 inhibition (similar to pharmaceutical ED drugs)
- Nitric oxide pathway enhancement
- Improved blood flow
- Anti-inflammatory effects
Dosage
- Typical range
- 500-1000 mg daily of 10% icariin extract (providing ~50-100 mg icariin)
- Timing
- Typically taken 30-60 minutes before sexual activity, or daily for chronic use
- With food
- May take with or without food; fatty meals may enhance absorption
- Duration
- Acute effects noted within 1-2 hours; chronic benefits develop over 2-4 weeks of daily use
- Special populations
- Caution in individuals taking nitrates or other ED medications; monitor blood pressure
Forms
- Extract· 70/100
- Capsule· 70/100
Safety
Common side effects
- Flushing
- Headache
- Mild digestive upset
- Dizziness
Contraindications
- Concurrent use with nitrates or phosphodiesterase inhibitors (sildenafil, etc.)
- Uncontrolled hypertension
- Recent cardiac events
- Severe liver or kidney disease
Products containing Epimedium brevicornum Extract (Leaf) - 10% Icariin
Top-scoring supplements in our catalog that list Epimedium brevicornum Extract (Leaf) - 10% Icariin on the label. Each product is graded on Formulate's ingredient-level rubric — dose accuracy, form, transparency, and third-party testing.
Evidence notes
In vivo and clinical studies support PDE-5 inhibition and erectile function improvement; human RCT data is moderate but emerging. 10% icariin is a meaningful standardization level.
Grade B: Some human trials support key claims; further confirmation needed.
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Medical disclaimer. This page is educational and does not replace advice from a qualified healthcare provider. Individual needs and risks vary — consult a professional before starting, stopping, or combining supplements, especially if you are pregnant or nursing, taking medication, or managing a health condition.