L-arginine supplementation in peripheral arterial disease: No benefit and possible harm

Abstract

BACKGROUND - l-Arginine is the precursor of endothelium-derived nitric oxide, an endogenous vasodilator. l-Arginine supplementation improves vascular reactivity and functional capacity in peripheral arterial disease (PAD) in small, short-term studies. We aimed to determine the effects of long-term administration of l-arginine on vascular reactivity and functional capacity in patients with PAD. METHODS AND RESULTS - The Nitric Oxide in Peripheral Arterial Insufficiency (NO-PAIN) study was a randomized clinical trial of oral l-arginine (3 g/d) versus placebo for 6 months in 133 subjects with intermittent claudication due to PAD in a single-center setting. The primary end point was the change a..