People take L-arganine supplements to treat several conditions, including congestive heart failure, high blood pressure, chest pain, coronary artery disease, leg pain because of blocked arteries, dementia, male infertility and erectile dysfunction, according to WebMD. People also use it to boost athletic performance and strengthen the immune system.
L-arganine is sometimes taken with prescription and over-the-counter medicines when treating several conditions. For instance, migraine headaches are sometimes treated with a combination of ibuprofen and L-arganine. It is also used with fish oil to improve healing time after surgery.
L-arganine works by opening up blood vessels wider after the body converts it into nitrous oxide. It also aids in the distribution of insulin and growth hormone.