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Abstract l -arginine, being a natural precursor of nitric oxide, is one of the more commonly used adjuvants to regular medicines in the treatment of erectile dysfunction. Objectives: Here, in this review article, we aim to highlight various studies and the research studies done on l -arginine in the treatment of erectile dysfunction. Method: Reviewing the databases such as Medline (PubMed), Cochrane Library, Excerpta Medica dataBASE, Trip, PsycINFO, Cumulative Index to Nursing and Allied Health Literature, the Allied and Complementary Medicine Database, and the British Nursing Index. Results: l -arginine has been studied alone as well as in combination with various other molecules for the treatment of erectile dysfunction, but the studies are very limited in number and have very small sample sizes. Conclusion: Positive evidence is available for the efficacy of l -arginine and its various combinations. Further research with larger sample sizes and standardized tools are required to recommend the routine use of these products in erectile dysfunction.