DPR is correct again on this. Many of the Chinese peptides are good, but many lack any quality control and some are just flat out garbage. I know SRC are made in the united states and are very good. I've also never heard a complain on RUI peps.
It's hard at times to pay for peps when you see them at other places so cheap, but I would rather pay a little more to know you are getting what you are supposed to and the quality will be there as well. I know a couple very popular research companies that use Chinese peps and some are great and then some suck. We do have good peptide sponsors here.