Also known as: Epimedium, Yin yang huo, Icariin, Barrenwort
Traditional Chinese herb with PDE5 inhibiting properties, though weaker than pharmaceuticals.
Daily use for ongoing effect
Those seeking mild erectile/libido support
We haven’t curated landmark studies for Horny Goat Weed (Epimedium)yet — one-click into the primary literature here. PubMed (RCTs) is usually the highest-signal starting point.
Traditional use, icariin has PDE5 effects but weaker than Viagra
Avoid
Safe short-term
Other ingredients in the Herbal category.
Formulate Research Team. (2026, September). Horny Goat Weed (Epimedium) — Evidence-Based Supplement Guide. Formulate Supplement Encyclopedia. https://app.formulate-health.app/learning/supplements/horny-goat-weed
Educational content based on published research and our scoring methodology. Not medical advice — consult a qualified healthcare provider before starting, stopping, or changing supplements, especially if you take medications, are pregnant, or have a medical condition.