Product Description L-Arginine is a conditionally essential basic amino acid, mainly involved in urea metabolism and excretion, and DNA synthesis. L-Arginine is a substrate for the synthesis of nitric oxide (NO), a cell-derived relaxant essential for regulating vascular tone and blood flow. It also supports the manufacture of creatine, the energy substrate of muscles. 95% of creatine is located in skeletal muscle. This is a double strength recipe. Our NOW® natural and organic supplements are an effective way to ensure you and your loved ones get the essential vitamins, minerals and nutrients for optimal daily health. Since 1968, we've been committed to helping people lead healthier lives by producing quality products that are tested to the highest standards. Security Information If you have human herpesvirus, sickle cell anemia, are taking antihypertensive drugs, cyclosporine, estrogen, birth control pills, medroxyprogesterone, norethindrone, nitrates, potassium increasing drugs, cediidine If you have gout, decreased platelet count, decreased blood urea nitrogen, increased serum creatine and creatinine, delayed menstruation, asthma, are pregnant or breastfeeding , do not use. Do not use if you have had a myocardial infarction (heart attack). Adult Dosage: Take 1-2 capsules twice daily with a carbohydrate drink between meals or at bedtime to enhance absorption. Do not use for more than 8 weeks. Legal Disclaimer Actual product packaging and materials may contain more and different information than that shown on our website. We advise you not to rely solely on the information presented and to always read labels, warnings and directions before using or consuming a product.