Epimedium's Icariin: Human Evidence vs. Animal Study

Epimedium's reputation and its actual human evidence base are two different things worth separating clearly.

What the research actually shows

Icariin, Epimedium's active compound, has been studied for effects on nitric oxide signalling and vasodilation — but human evidence remains limited, with most encouraging results coming from laboratory and animal work.

Why the icariin percentage matters as much as the ingredient name

What matters most for this specific ingredient is the icariin percentage of the extract used — a detail that isn't stated for this formula, making the ingredient harder to evaluate than its name alone suggests.