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L-Arginine is one the most widely used amino acid supplements in and out of the gym. An important amino acid, L-arginine is one of the building blocks of protein, but it also supports healthy immune function... and some even use it to promote healthy erectile function, as L-arginine helps support vasodilation for healthy blood flow to tissues. In general, L-arginine helps make the most out of your regular exercise routine. From pharmaceutical grade L-arginine supplements to lemon flavored arginine powder, SwansonVitamins.com is your source for high-quality, low-price L-arginine.