This study investigated the effects of the amino acid arginine on peripheral vascular disease, a common circulatory problem in which narrowed arteries reduce blood flow to the limbs. 39 patients were given either arginine, a conventional drug or no treatment for 3 weeks. The results showed that arginine improved the symptoms of peripheral arterial disease. Further details can be found in the study.
Robinson K, Arheart K, Refsum H, Brattström L, Boers G, Ueland P, Rubba P, Palma-Reis R, Meleady R, Daly L, Witteman J, Graham I