I dont mean to come across as a smart Alec or anything, but i strongly strongly discourage taking ANY supplement without understanding the effects it can have on the human body. And great advice PHoeNIX, ignore anything supplement companies say, they are interrested in taking your money and that is that.
As for these supplements, here goes. Basically, these supplements are designed to "give you a pump." The reason for this is the arginine is supposed to cause
nitrous oxide release, which will induce blood flow via vasodilation (a widening of the veins) which fucks around with your blood pressure. Vasodilation will cause a significant drop in both systolic and diastolic blood pressure. Because of this, your brain is forced to constrict blood vessels to the brain to prevent too much blood and raise blood pressure, if it doesnt do this, you will go into shock, however, it is possible it could overconstrict, thus depriving your brain of necessary blood flow. It is a dangerous sequence. This is why dizziness is a common side effect of Nitrous Oxide supplementation.
Combined with the price tag, do not take any of these type products. I can also provide some more research of adverse effects if requested.
edited: to fix typos
