Description Advanced Erectile Function (EF) Formula Super Strength 3000 mg per Serving Supports Sexual Health Promotes Stamina and Performance Dietary Supplement 100% Vegetarian. Nature has provided an elegant solution to promote optimal EF (Erectile Function). Natrol L-Arginine 3000 mg helps support vasodilatation to enhance blood flow to tissues. The added B vitamins are vital to the body's energy production. The result - lasting energy, stamina and performance. L-Arginine 3000 mg is part of Natrol's full line of Just for Men" products including Yohimbe Bark, ProstatExcell and Saw Palmetto.