Janoshik

Janoshik Analytical is one of the most frequently cited independent third-party labs for peptide and AAS testing in the research-vendor ecosystem. They publish HPLC purity, mass-spec identification, and quantitative content analysis on a per-sample basis.

A Janoshik COA referencing a specific batch / lot number is generally considered a credible third-party quality signal in the research-peptide community. As with any single lab, however, the strongest quality evidence is consistency across multiple batches and ideally cross-corroboration from a second independent lab.

Janoshik COAs are sometimes posted publicly by vendors and sometimes available only on request. Either way, the COA should reference a batch number that matches the vial label.