L-Arginine Products

L-arginine is an amino acid found in protein-containing foods and also made by the body. It is used to make proteins and serves as a precursor for compounds including nitric oxide and creatine.

L-arginine is often included because the body can use it to make nitric oxide, which participates in blood-vessel signaling. However, human studies provide limited and conflicting evidence that supplemental arginine improves exercise performance.

Measure and mix L-arginine powder only as directed on the product label. Higher intakes can cause gastrointestinal discomfort, and supplements can interact with medicines, so ask a healthcare professional if you use medication or have a health condition.