Absolutely!
There are some very reliable blood testing results posted on ProMuscle. This one guy was doing blood work at Lab Corp 1 hour after injecting and 2 weeks into using saturation doses of mod GRF 1-29 and Ipamorelin, 3x/d. The IGF levels went from a baseline of 227 to 406 which is a 179 point increase in IGF-1. Previously he had done the same procedure on 4iu of pharma hGH and hit 380ng/ml. So according to this guy's blood work 3x/d peptide use at saturation level doses + to 4.2iu of hGH. No doubt results are very individual but you can see this combination works as good or better than using 4iu of hGH. It generally takes 3-4 weeks before IGF-1 returns to baseline after you stop using the peptides.
higher level of GH ARE observed between 15 and 30 min after subcutaneous administration.
Here is another blood test by a doctor over at PM
1) Yesteday fasting since 11pm the night before
2) Inject 500mcg of Mod GRF1-29 and 250mcg of GHRP-2 SubQ
3) Draw serum GH exactly 40min after injection

He further found through more blood testing that the 100/100mcg combo works just as well than the 500/250mcg dosage.
Here is another myth clearing blood test:

So does taking peptides after eating blunt the GH response? If you guys remember the last GRF/GHRP-2 100/100 was 19.5, so for this to come at 18.9 is a 3% difference which is pretty much none. Seems this is not a very significant drop. So the myth seems to have been busted. I pointed this out to DAT years ago and it caused a big riff between him and I because I disagreed with him that peptides must be taken on an empty stomach.
I initially did GRF/Ipam 100/250mcg and tested fasting at 40min. Not such good results here, huh? GH went from 4.0 - 2.2

GRF/IPAM 100/250mcg 2hours post injection....not much better

Next - combo of GRF/Ipam at 100/500mcg and tested at two hours fasting

Big difference between the two guys who did blood testing. I have never done blood testing using any of the peptides however, I have found myself that 500mg of Ipamorelin is the starting point if you want to see your GH and IGF-1 levels rise. I have always done 1000mg/day at bedtime combined with modified GRF 1-29. Other than that I will not use Ipamorelin because it is just not cost effective when the other GHRPs get better results.