2 X Irwin Naturals, Nitric Oxide Pre-Sport� with L-Citrulline, 60 Liquid Soft-G
This unique formula features L-Citrulline, an amino acid that is readily converted to L-Arginine, which can then be converted into Nitric Oxide within the body. This product can be taken an hour before engaging in any sporting activity or can be taken daily for ongoing maintenance.