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Research suggests that taking L-arginine by mouth or intravenously (by IV) for up to 8 weeks increases blood flow in people with peripheral arterial disease. However, long-term use (up to 6 months) does not improve walking speed or distance in people with peripheral arterial disease.
L-Arginine Benefits, Erectile Dysfunction and Side Effects. L-Arginine Benefits and Side Effects. While there are many amino acids taken from proteins that are beneficial to health, one specifically stands among the others when it comes to sexual health. The amino acid in question that has been receiving a lot of attention is L-Arginine.