This Italian Zing Marinade by Cajun Injector is made to be used for those same recipes that call for marinating meats with Italian dressing.  So why would you use the Italian Zing marinade instead of Italian dressing?  The Italian Zing marinade is made specifically for injecting meats.  The Italian dressing marinade is thicker than a dressing, which works better for marinade . . . even when you are just setting the meat in the marinade to marinate.