L Arginine and Nitric Oxide in Vascular RegulationExperimental Findings in the Context of Blood Donation L Arginine & Proanthocyanidin granules belong to the class of nutritional supplements. Use of L Arginine and Praonthocyanidin granules: L arginine and proanthocyanidin granules are a nutritional supplement blend, often used to improve cardiovascular Did you know L carnitine, a vital amino acid, is naturally produced by your body and found in various foods? While acetyl L carnitine (ALCAR) can be a beneficial supplement for some, most people get Amazon.com: Promescent VitaFLUX Nitric Oxide Supplements for Men, Fast Acting Male Enhancing Pills for Stamina, Size & Performance, L Arginine L Citrulline L Carnitine (30 Servings) : Health & Household