Pre-workout supplements make big promises to boost your performance, and with those promises come high price tags. You supposedly get a burst of energy, fatigue less easily, and increase blood flow, all to help you get more out of your workout. The thing is, these supplements are really just powerful stimulants.
I know some who buy the raw ingredients cheap, and mix them themselves. They work out after work, so they don’t have to worry about caffeine messing with their sleep.