L-Arginine is an amino acid found in red meat, poultry, fish, and dairy products. This amino acid is an integral component to the protein called Myelin Basic Protein, which is a necessary insulator to the neurons. It is also synthesized and used as a medication, often to improve circulation in those with cardiovascular conditions, blocked arteries, reduced cognitive capacity, and male sexual difficulties. It is also used in combination with medicines for migraines, countering the effects of chemotherapy, and for improved healing after surgery. It achieves many of these effects by being converted into nitric oxide, which opens blood vessels and stimulates growth hormone.