In the body, the amino acid arginine changes into nitric oxide (NO). Nitric oxide is a powerful neurotransmitter that helps blood vessels relax and also improves circulation. Some evidence shows that arginine may help improve blood flow in the arteries of the heart. That may improve symptoms of clogged arteries, chest pain or angina, and coronary artery disease. However, there currently is no data on how the long-term use of arginine affects cholesterol or heart health. Since arginine may help arteries relax and improve blood flow, it may also help with erectile dysfunction. There are other potential health benefits with arginine, such as possible reduction of blood pressure in some people and improved walking distance in patients with intermittent leg cramping and weakness known as intermittent claudication. However, the scientific studies are not conclusive enough for experts to make any firm recommendations Not all studies on arginine have been positive. A 2006 study showed that arginine was not helpful -- and may have been harmful -- for treating heart attacks in combination with standard treatment.
Side effect:
In clinical trials, arginine has been used safely with minor side effects for up to three months. Possible side effects include abdominal pain and bloating, diarrhea, and gout. It may also cause a worsening of breathing in people with asthma.
Interactions:
Arginine may interact with certain medications that lower blood pressure. It may also interact with certain heart medications and drugs such as Viagra that treat erectile dysfuncti