an important amino acid for releasing nitric
oxide into the bloodstream, improve the
health of the circulatory system and heart,
release growth hormone, promote relaxation,
and keep blood pressure normal. L-Arginne is in almost all of your pre-workout drinks, which is what gives you the "pump" you feel during or after your workout. I typically buy the amino-acid seperate from the pre-workouts because it's way cheaper and you usually don't know what else is in the pre-workout drinks.