Nxlabs had a supplement called Plasmavol that was pretty much only for Vascularity. Glycerine was the main ingrediant. Of course Arginine, citruline, and Pine bark extract will help. I think GPLC should top the list now, especially with all the other health benefits that go along with it.
Back in the day Muscletech had a decent NO product, I cant remember the name, but it worked good for me. It had Pine Bark extract in it, and ive heard a lot of good things about it. Its just really expensive on its own.