The Human Immunodeficiency Virus (HIV) is one of the worldâs most confusing and complex viruses. In this series, we will strip away the scientific jargon and provide a straightforward guide to HIV with the Elizabeth Glaser Pediatric AIDS Foundation (EGPAF)âs Director of Basic and Clinical Research Jeffrey Safrit.
In the body, L-citrulline is converted to the amino acid L-arginine, which goes on to make another important substance nitric oxide. And nitric oxide is the secret to hard, firm, healthy erections. Heres how it worksâ¦.
In this Article. In this Article. In this Article. Men need a lot of different body parts working the right way -- from the brain and glands that control hormones to blood vessels and the penis -- to get and keep an erection. Because of that, erectile dysfunction, or ED, can have a lot of causes. Some of them are physical; others are mental and emotional. Physical reasons for ED range from heart disease and diabetes to high blood pressure and obesity. Damage to your nerves or arteries can cause problems with erections, too.