If you're regularly involved in strenuous exercise or are concerned about your cardiovascular health, you might find a supplement called L-citrulline of potential value. Citrulline is an amino acid that's considered nonessential because your body makes a sufficient supply and dietary intake isn't essential. After your digestive system metabolizes L-citrulline into citrulline, enzymes in your liver cells convert it into another amino acid called arginine, and other enzymes then convert arginine into nitric oxide in a process that also produces new citrulline molecules. Nitric oxide is a vasodilator that can help protect you from cardiovascular problems by lowering blood pressure and improving blood flow to your organs, according to experts at the University of Southern California.

Nutritional supplement products are not intended to diagnose, treat, cure or prevent any disease. Dietary supplements supplement your diet, they do not replace it. You should consult your physician before taking vitamins, minerals, health nutritional supplements or herbal products.