Citrulline bypasses the liver and gets transformed to arginine, which raises NO concentrations in your body. I'm sure you have seen that some health supplements have L-Citrulline in them, and a few have Citrulline Malate. To bypass the lackluster efficacy of plain oral Arginine, Nutrition 21 (the developers of Nitrosigine) https://smmpanel64185.amoblog.com/about-gorilla-mode-nitric-41074127