The amino acid L-arginine is the precursor to nitric oxide, a compound needed for normal endothelial function, blood vessel tone, and blood pressure. Chinese researchers analyzed the findings of 13 clinical trials using L-arginine supplements. They found that the supplements improved blood vessel flexibility in people who had poor flexibility, but had no effect on those who already had good blood vessel tone. Doses of L-arginine in the studies ranged from 3 to 21 grams daily. Bai Y. American Journal of Clinical Nutrition, 2009; 89:77-84. | ||
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