The purpose of a pre workout supplement is to improve performance but these days pre workout products have become nothing more than massive stimulant bombs. This constricts blood vessels and prevents blood, oxygen and nutrients from reaching the muscles at the most crucial time. Han Swolo has no stimulants. Instead it is full of ingredients that inflate your blood vessels to the absolute max which helps deliver needed nutrients for growth and oxygen for performance and strength. Han Swolo delivers performance enhancement not over stimulation. Shirt tearing, vein popping pumps.