Nitric oxide supplements are quickly becoming a favorite among serious weight trainers. That being said, many trainers and athletes don’t know the benefits they would gain from using nitric oxide supplements. The body needs nitric oxide because it boosts the flow of blood. By breaking down amino acids, the body produces its own nitric oxide, but the amounts produced are usually not enough. The body simply does not produce enough of the gas to make it possible to train as hard and as long as you would like.