The plant's common name gets attention, but the actual research interest is in a specific compound it contains, called icariin.
Icariin is what shows up repeatedly in studies connected to blood flow, which is why formulas in this category standardize for it rather than just listing the raw plant.
It's the one ingredient here doing circulation-specific work, distinct from the hormone-balance or energy roles the others play.
In this formula: Horny Goat Weed is one of six named ingredients — see the full division of labor on our how it works page.