from Sheldon G. Sheps, M.D.Click here to view the full reply on Mayo Clinic.
L-arginine could play a role in lowering blood pressure because a major cause of high blood pressure is narrowing of the arteries. The innermost layer of cells in your arteries releases nitric oxide to widen the arteries, and L-arginine is a source of nitric oxide in the body. In theory, taking an L-arginine supplement should reduce blood pressure. However, there's no evidence that this is true.
Also, your body usually makes all the L-arginine it needs, and taking a supplement is rarely necessary. You also get some L-arginine from foods like nuts, red meat and some dairy products.
L-arginine supplements can interact with some medications, including nitroglycerin and high blood pressure medications such as angiotensin-converting enzyme (ACE) inhibitors. People who have had cold sores or genital herpes also shouldn't take L-arginine supplements, because having too much L-arginine in your system can trigger the virus that caus...
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