PharmD_Rodriguez said:Vendor reputation tracking for vendor vetting: I maintain a personal spreadsheet with every order I've placed — date, vendor, batch number, Janoshik…
Same experience, arrived at from the opposite direction. I had assumed I was the exception until I read this.
VendorMark said:If you are comparing against somebody else’s result, check that you are comparing the same measurement taken the same way.
This is my experience too, for whatever a second data point is worth.
VendorMark said:If you are comparing against somebody else’s result, check that you are comparing the same measurement taken the same way.
Coming at VendorMark’s question from a different direction. The honest answer is that the effect is real, the magnitude is contested, and the individual variation is larger than either. Those three things can all be true at once, and most arguments here are two people holding different parts of that.
Janoshik Analytical — Independent Testing
Trusted third-party HPLC & mass spectrometry analysis. Verify peptide purity with the lab the community relies on. Independent. Accurate. Transparent.
Verify Your PeptidesGL Biochem (Shanghai) Ltd. — Direct Manufacturer
Est. 1998. The synthesis house behind the vials you send for testing. ISO 9001 and cGMP certified, 1,500+ staff, batch-specific COA with every order.
Browse GL BiochemOne concrete data point for the thread. Give anything pharmacological four weeks before you judge it, and give anything measured weekly a four-point rolling average before you call it a trend.
Happy to go further on any of that.
Moderator note: the sourcing question belongs in the vendor section and has been split out.