Also known as: Epimedium, Yin Yang Huo, Barrenwort
Horny goat weed (Epimedium) is a traditional Chinese medicinal herb whose primary active compound, icariin, has been studied for its effects on sexual health, bone density, and vascular function. Evidence in humans is still emerging.
Horny goat weed encompasses several species of Epimedium used in traditional Chinese medicine for over 2,000 years as a yang-tonifying herb. The primary bioactive constituent is icariin, a prenylated flavonoid glycoside. In vitro and animal studies show that icariin inhibits phosphodiesterase type 5 (PDE5), similar in mechanism to sildenafil, supporting increased nitric oxide and blood flow. Icariin also promotes osteoblast differentiation and inhibits osteoclast activity, suggesting bone-protective effects. Preclinical evidence indicates neuroprotective and anti-inflammatory properties. However, human clinical trials remain limited, and most evidence derives from cell culture and animal models. Bioavailability of icariin is inherently low, though newer formulations aim to improve absorption. Epimedium is available as dried herb, powdered extracts standardized to icariin content, and combination formulas.
Icariin acts as a natural PDE5 inhibitor in preclinical studies, promoting nitric oxide-mediated vasodilation. Limited human evidence suggests modest improvements in erectile function.
Animal and in vitro studies show icariin promotes osteoblast differentiation and inhibits bone resorption, with potential relevance for osteoporosis prevention.
Once or twice daily with meals
Choose extracts standardized to icariin content for consistency. Human dosing is not well established; start at the lower end.
Consistent icariin dosing
Traditional preparation and blending
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