The Nitrox Pump is made up of several ingredients that have been selected as they have been associated with increased production of nitric oxide in the muscles. Nitric oxide synthases (NOS) are enzymes that convert Arginine and citrulline to nitric oxide. Nitric oxide is a key biological messenger, playing a role in a variety of biological processes. It is known as a vasodilator which enhances blood flow in the body which could in theory increase the delivery of oxygen and nutrients to exercising muscle. This is associated with enhanced muscle pumps during exercise. A low level of nitric oxide is associated with physical fatigue.
MuscleTech sponsors professional competitive bodybuilders Santi Aragon and Marc Megna, both of whom incorporate this product into their workout routines. Santi Aragon is an International Federation of Bodybuilding and Fitness professional bodybuilder who has won a number of top-level NPC shows in recent years including the Nationals, Southern States, USA Championships and Teen Nationals. Marc Megna is a personal trainer and coach who formerly played professional football in both the CFL and the NFL and is a regular columnist in major men’s fitness magazines.
In January 2003, Hardy briefly turned into a heel (villain) after he attacked Van Dam and Shawn Michaels .    It ended a month later when he saved Stacy Keibler from an attack by then-villain, Christian .  In February, he had a brief program with Michaels, which saw the two team up.   Then, in storyline, Hardy began dating Trish Stratus after saving her from Steven Richards and Victoria in March.  Hardy and Stratus had a brief on-screen relationship that saw the duo talking backstage and teaming together in matches. Hardy competed in his final match (his first departure) against The Rock and lost.   Hardy was released from WWE on April 22, 2003.   The reasons given for the release were Hardy's erratic behavior, drug use, refusal to go to rehab, deteriorating ring performance, as well as constant tardiness and no-showing events.   Hardy also cites "burn out" and the need for time off as reasons for leaving WWE.