I have purchased pt-141 from a few companies like Swiss Chem, Elite peptides and peptide science and all ae about the same, you can get the water from them as well.I've had good luck with Peptide Sciences, nootropic source and recon peptides. Also, I use melanotan II instead during the winter months. I use Bac water left over from my HCG although I think there is a company called something like medlab gear that supplies it as well.
Even though sone companies seem to work better than others is a risk you take purchasing on internet and every body can and will react differently I had this curiosity so the recent change to my PT-141 I was to get my primary Dr to write a script directly to a compound pharmacy....I succeeded difference is visable