Stacked—N.O. Powder contains a few core ingredients designed to do one thing well and that is enhance muscle pumps via increasing blood flow. It starts with the catalyst blend of ornithine, HICA and Astrigin™. The remaining ingredients include niacin, vitamin B-12, citrulline and agmatine sulfate. It’s available in two flavors, Strawberry Lemonade and Cherry Limeade.