Source Naturals L-Arginine 1000mg， 100 Tablets (Pack of 2)<div style="text-align: left;"><strong>[Product Information]</strong><ul><li class="showHiddenFeatureBullets"><span class="a-list-item"> A crystalline， free-form amino acid </span></li><li class="showHiddenFeatureBullets"><span class="a-list-item"> An important factor in muscle metabolism </span></li><li class="showHiddenFeatureBullets"><span class="a-list-item"> Works to transport， store， and excrete nitrogen </span></li><li class="showHiddenFeatureBullets"><span class="a-list-item"> A precursor for nitric oxide， which promotes increased circulation by relaxing blood vessels </span></li><li class="showHiddenFeatureBullets"><span class="a-list-item"> Also a precursor of guanidophosphate， phosphoarginine， and creatine， the high-energy compounds found in muscles </span></li></ul></div><img src="http://ecx.images-amazon.com/images/I/41e2Dv7qTYL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/41dNLciyFiL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/418%2BeudsttL.jpg" noproxy>