Ans: L-arginine supplements are one of the best-selling sexual performance enhancers in the market. It is a form of amino acid that contains the raw materials needed by the body to synthesize nitric oxide. This helps the blood vessels to relax by opening them wider and ensuring stronger blood flow. It is an important step needed for the penis to achieve an erection. However, the true effectiveness of the same is unknown. People suffering from any existing or pre-existing heart conditions should avoid taking L-arginine pills as they can cause life-threatening complications.