# Epimedium sagittatum (Horny Goat Weed) **Canonical URL:** https://ingredients.hermeticasuperfoods.com/ingredients/epimedium-sagittatum **Data Source:** Hermetica Superfoods Ingredient Encyclopedia **Updated:** 2026-03-19 **Evidence Score:** 6 / 10 **Category:** Traditional Chinese Medicine **Also Known As:** Epimedium sagittatum, Yin Yang Huo, Barrenwort, Bishop's Hat, Fairy Wings, Rowdy Lamb Herb, Epimedii Herba ## Overview Horny goat weed (Epimedium sagittatum) is a traditional Chinese medicinal herb containing icariin as its primary bioactive compound. Icariin acts as a phosphodiesterase-5 (PDE5) inhibitor and phytoestrogen, potentially supporting sexual function and [bone health](/ingredients/condition/bone-health) through improved blood flow and estrogen receptor modulation. ## Health Benefits • May support sexual function and satisfaction (limited clinical evidence from small trials) • Potential cardiovascular benefits for [blood pressure](/ingredients/condition/heart-health) and coronary artery disease (preliminary small trial data only) • Shows phytoestrogenic effects that may support [bone health](/ingredients/condition/bone-health) and menstrual irregularities (traditional use, mechanistic studies only) • Demonstrates [anti-inflammatory](/ingredients/condition/inflammation) and [immunomodulatory](/ingredients/condition/immune-support) properties (in vitro studies only) • May enhance blood flow through flavonoid activity (mechanistic studies, no large clinical trials) ## Mechanism of Action The primary bioactive compound icariin inhibits phosphodiesterase-5 (PDE5) enzyme, increasing cyclic GMP levels and promoting smooth [muscle relaxation](/ingredients/condition/sleep) in blood vessels. Icariin also acts as a phytoestrogen, binding to estrogen receptors alpha and beta to influence bone [metabolism](/ingredients/condition/weight-management) and [cardiovascular](/ingredients/condition/heart-health) function. Additionally, it may enhance nitric oxide production through endothelial nitric oxide synthase (eNOS) activation. ## Clinical Summary Limited clinical evidence comes from small trials with 20-60 participants studying sexual function outcomes. One 12-week study showed modest improvements in erectile function scores compared to placebo, though sample sizes were insufficient for definitive conclusions. Preliminary cardiovascular studies suggest potential [blood pressure](/ingredients/condition/heart-health) reductions of 5-8 mmHg, but these findings require replication in larger, well-controlled trials. Most research relies on animal studies and in vitro data rather than robust human clinical evidence. ## Nutritional Profile Epimedium sagittatum is a medicinal herb rather than a dietary staple, so its nutritional profile is characterized primarily by bioactive phytochemicals rather than macronutrient content. Dried aerial parts contain approximately 5–10% total flavonoids by weight, with icariin being the principal bioactive compound at concentrations of 1–5% in dried leaf material (varying significantly by plant part, season, and processing method). Icariin is a prenylated flavonol glycoside and serves as the primary marker compound for standardized extracts. Other key flavonoids include icariside I, icariside II (des-O-methylicariiin), epimedin A, epimedin B, and epimedin C, collectively present at 0.5–3% of dry weight. Baohuoside-1 (icariside II) is a deglycosylated metabolite formed during [digestion](/ingredients/condition/gut-health) and is considered more bioavailable than icariin itself. The herb contains polysaccharides at approximately 8–15% dry weight, contributing [immunomodulatory](/ingredients/condition/immune-support) activity. Lignans including epimedokoreanin and magnoflorine alkaloids are present in trace amounts (<0.1%). Phytosterols including beta-sitosterol are present at approximately 0.1–0.3%. Mineral content includes calcium (~1,200–1,800 mg/100g dry weight), magnesium (~200–300 mg/100g), potassium (~800–1,200 mg/100g), manganese (~15–25 mg/100g), and zinc (~2–5 mg/100g), though these are not primary reasons for therapeutic use. Crude protein content is approximately 10–15% dry weight and crude fiber approximately 20–30% dry weight. Bioavailability note: Icariin has poor oral bioavailability (~5–10%) due to its glycoside structure; intestinal and hepatic [metabolism](/ingredients/condition/weight-management) converts it to more active aglycones (icaritin) and icariside II, which show greater membrane permeability. Lipid-based delivery systems and piperine co-administration have been shown experimentally to improve absorption. Total phenolic content is approximately 30–60 mg gallic acid equivalents per gram of dried extract. ## Dosage & Preparation Clinically studied doses include tablets or capsules of 250-500 mg daily. A phytoestrogen extract containing 60 mg icariin and 15 mg daidzein has been taken safely for up to 2 years, while an icariin-containing extract has been used for up to 6 months. Commercial extracts are often standardized to 10% flavones tested as icariin. Consult a healthcare provider before starting any new supplement. ## Safety & Drug Interactions Common side effects include dizziness, nausea, dry mouth, and nosebleeds at doses above 20g daily of raw herb. Horny goat weed may interact with blood thinners like warfarin due to potential anticoagulant effects, and could enhance hypotensive medications. It should be avoided during pregnancy and breastfeeding due to lack of safety data and potential hormonal effects. Individuals with hormone-sensitive conditions should exercise caution due to its phytoestrogenic properties. ## Scientific Research Clinical evidence for Epimedium sagittatum is limited, with no large-scale RCTs or meta-analyses identified. Small trials have shown promising effects for high [blood pressure](/ingredients/condition/heart-health), coronary artery disease, and sexual satisfaction, but these have not been confirmed in rigorous prospective controlled trials. In vitro and animal studies demonstrate cytotoxic effects on hepatoma and leukemia cells, though no PubMed PMIDs for key human RCTs are available. ## Historical & Cultural Context In Traditional Chinese Medicine and East Asian systems, Epimedium sagittatum has been used for centuries as a tonic and aphrodisiac. Historical applications include treatment for fatigue, arthritic and nerve pain, sexual dysfunction, menstrual irregularities, [osteoporosis](/ingredients/condition/bone-health), asthma, nephritis, and [cardiovascular](/ingredients/condition/heart-health) disease. ## Synergistic Combinations Tongkat ali, Tribulus terrestris, Maca root, L-arginine, Ginkgo biloba ## Frequently Asked Questions ### How much icariin should I take daily? Most supplements provide 10-60mg of icariin per serving, though optimal dosing remains unclear. Traditional preparations typically use 5-15g of dried herb daily, standardized to 10-20% icariin content. ### How long does horny goat weed take to work? Limited studies suggest potential effects may be noticed within 45 days of consistent use. However, individual responses vary significantly and robust clinical data on onset timing is lacking. ### Can women take horny goat weed safely? Women may use horny goat weed for bone health support due to its phytoestrogenic effects. However, those with hormone-sensitive conditions or taking hormone replacement therapy should consult healthcare providers first. ### Does horny goat weed interact with Viagra? Both horny goat weed and Viagra inhibit PDE5 enzymes, potentially causing additive effects and dangerous blood pressure drops. This combination should only be used under strict medical supervision. ### What's the difference between horny goat weed species? Epimedium sagittatum typically contains the highest icariin concentrations (up to 5% dry weight) compared to other species like E. brevicornu or E. grandiflorum. Sagittatum is considered the most potent for traditional medicinal uses. ### Is horny goat weed safe during pregnancy and breastfeeding? Horny goat weed is not recommended during pregnancy due to its phytoestrogenic properties, which may interfere with hormonal balance critical for fetal development. Similarly, it should be avoided while breastfeeding, as its active compounds may transfer to breast milk and affect nursing infants. Pregnant and breastfeeding women should consult their healthcare provider before using any horny goat weed supplement. ### What does the clinical research actually show about horny goat weed's effectiveness? Current clinical evidence for horny goat weed is limited, with most studies being small and conducted primarily in Asian populations. While some trials suggest potential benefits for sexual function and blood pressure, the overall quality and quantity of evidence remains preliminary, and larger, well-designed studies are needed to confirm efficacy. Most health claims are supported more by traditional use and animal/mechanistic research than by robust human clinical trials. ### Can older adults safely take horny goat weed, especially those on blood pressure medications? Horny goat weed may be used by older adults, but caution is warranted for those taking blood pressure or cardiovascular medications, as the herb has shown preliminary effects on blood pressure regulation. Seniors should consult their healthcare provider before supplementing, particularly if they take antiplatelet agents, anticoagulants, or blood pressure medications. Individual health status and potential drug interactions should be evaluated on a case-by-case basis. --- *Source: Hermetica Superfoods Ingredient Encyclopedia — https://ingredients.hermeticasuperfoods.com* *License: CC BY-NC-SA 4.0 — Attribution required. Commercial use: admin@hermeticasuperfoods.com*