L-Arginine is a conditionally essential amino acid and is precursor for the synthesis of nitric oxide and protein in the body.Healthy Origins® L-Arginine-SR is a unique formulation that utilizes a sustained release delivery system specifically manufactured to release the L-Arginine continuously over a 5 -7 hour period. These statements have not been evaluated by the Food and Drug Administration (FDA). These products are not meant to diagnose? treat or cure any disease or medical condition. Please consult your doctor before starting any exercise or nutritional supplement program or before using these or any product during pregnancy or if you have a serious medical condition. CALIFORNIA PROPOSITION 65 WARNING: This product contains a chemical known to the state of California to cause cancer, birth defects or other reproductive harm.