Definitely makes a difference
I haven't yet tried other arginine supplements, but this one definitely makes me feel like the incredible hulk in the gym.  I started off taking half the suggested dose, and felt a little bit of an increase, but I saw a bunch of people saying that they had weird side effects.  I never had any negative side effects, and have only had positive results, and I KNOW it's not placebo because the whole reason i decided to try arginine is because I had plateaued at the gym.
Rating: 5 stars