L-Arginine is a common amino acid that stimulates blood flow. It is produced naturally by the human body and is commonly found in meat and dairy products.

Because of L-Arginine’s ability to reduce anxiety and promote sexual responsiveness, it is often used as a libido-enhancing ingredient in personal lubricant products. L-Arginine is generally considered a safe lubricant ingredient, but in large amounts, it can worsen the symptoms of asthma and other inflammatory lung conditions. L’Arginine is also known to be a vasodilator which increases blood flow to the area which the product is applied to. Many personal lubricants and sexual stimulators on the market today contain L-Arginine. L-Arginine should be avoided by individuals who have herpes as the vasodilator has been known to cause outbreaks.