I tested ghrp 2, ghrp 6, and cjc 1295 from 4 different suppliers. I was testing to see if the sequence was correct using Mass Spectrometry. Quite a simple process to follow and the results will tell you if the correct sequance for peptide production has been used.
http://biochem.ncsu.edu/MassSpec/docs/PeptideSequencingMS.pdf
All 4 suppliers had incorrect sequencing, so i am unable to tell you what they were supplying, but i can tell you it was not the product advertised. I have contacted 3 of the suppliers via email with a "please explain" but suddenly they refuse to reply.