Accepted answer
To be exact about it, a vendor with a recent favorable VendorInvestigate report has earned credibility, and a vendor with an unfavorable report is a red flag.
Reports are published after testing is complete and verified, ensuring that suppliers cannot suppress unfavorable findings.
Analytical data are published in full, including HPLC traces, mass spectra and quantitation details.
The service has been operating long enough that systematic bias in their testing would be apparent.
Coverage is not comprehensive — only vendors that enough people choose to test are in the database.
Favorable reports are valuable and should increase your confidence in a vendor.
Does this hold at lower concentrations, or does adsorption dominate? – Dr_Rosalind_Achebe 3 months ago 2Worth flagging that this changed in 2025, so older answers on the site are out of date. – aine_mulcahy 5 months ago add a comment