For those of you who enjoy a good "pump" as I do, I have found that combining a good arginine product like NitroCeps or Hemavol with 4.5 gms of GPLC provides unprecented "pumps". For GPLC I use either PP's GPLC or NO Bomb. These are the one's I use but I'm sure there are others that are just a good. Adding creatine nitrate my help as well. The combination of GPLC and arginine works so well that I haven't tried adding creatine nitrate but I'm sure that I will in the near future.