Found this in my training research files, can't remember where it's from. I just copied and pasted into my files.
"Cambell, roberts and bounty (2004) found that When arginine (1.2g) was ingested along with the amino acid lysine (1.2g) in young males, peak plasma growth hormone concentrations increased 8-fold at 90 minutes post-ingestion"
I thought it was interesting. Good luck getting real aminos though and not just a load of magnesium stearate and rice flour in capsules.