Nitric Oxide (N.O.) is a cellular gas that causes blood vessels to dilate, engorging the muscles with blood, increasing oxygen & nutrient delivery, and facilitating the removal of metabolic waste products that lead to fatigue. This cascade of events is what�s known as "The PUMP." Consumed in sufficient amounts, Arginine is one of the best, if not the best, precursors of N.O. synthesis in the body. That�s why it;s the cornerstone of our Vassive N.O. Formula-X and why you'll find a hefty 3-gram dose in every serving. For added effectiveness, we've also included Citrulline Malate, Histidine, Norvaline, Ginseng, and other pump-potentiating compounds and packed them all into a sustained-release matrix for results that last throughout your toughest training sessions. Beyond The Basics * Sustained Release Delivery System Promotes All-Day N.O. Activation * Convenient 3-Tablet Serving Size * No Caffeine * Part of the Vassive Size & Strength Stack