Blood Flow L-Arginine is an amino acid that acts as a vasodilator. It converts into nitric oxide in the body. Nitric oxide causes blood vessels to open wider for improved blood flow. Bigger Pumps Supplementing with L-Arginine can help enhance your workout performance. The increase in Nitric Oxide helps improve blood and oxygen flow to muscles. This makes getting a great muscle pump easier, especially if L-Arginine is stacked with a good pre-workout. Male Performance Support Aside from supporting your efforts in the gym, L-Arginine can also be beneficial where men may need it most, in the bedroom! Improving blood flow can have a wide range of positive effects, one of them being supporting maximum male performance. Easy To Use Capsules Our L-ARGININE 1000 delivers a full 1000 mg per serving. Simply add it to your favorite pre-workout or libido booster. L-Arginine works best when taken daily.