L-citrulline boosts nitric oxide production in the body. Nitric oxide helps your arteries relax and work better, which improves blood flow throughout your body. This may be helpful for treating or preventing some diseases.

Does Citrulline cause boners?

The L-citrulline to NO path increases blood flow to a man's genitals. In one study, this increase in blood flow appeared to decrease symptoms of mild ED and improve the ability to maintain an erection. There haven't been any studies on the use of L-citrulline in moderate to severe cases of ED.

What does Citrulline do in pre workout?

Summary: Citrulline may increase oxygen content in the muscles and improve exercise performance. Both endurance performance and weight training performance may be improved by taking supplements.