I was recently on an L-Arginine supplement. I happen to have hypertension and am on Hydrocholrot(sp.) for it. Anyway I saw a dramatic lowering of blood pressure after being on the Arginine for a month. I wonder why more people don't use this supplement for this purpose. I am off of it now and my blood pressure has shot up again. I'm thinking of getting some bulk powder from Nutraplanet now. The stuff if great!.