Short answer: Horny Goat Weed Extract contains icariin, a compound studied for its potential role in supporting blood flow, commonly used in men's performance formulas.
Why naming icariin specifically matters
Rather than a vague "horny goat weed" claim, naming the specific active compound gives you something concrete and checkable to research independently.
Why this ingredient carries the same caution as L-Arginine
Because L-Arginine and Horny Goat Weed Extract are both studied for effects on blood flow, anyone taking blood pressure medication, nitrate medications, or blood-flow-related prescriptions should talk to a doctor first.
⚠️ Worth knowing: this shared caution reflects a genuine, mechanism-based overlap between these two specific ingredients.