Source comparison
Third-Party Verification vs In-House Testing
Every peptide supplier provides a Certificate of Analysis (COA). The question researchers rarely ask: who generated that COA? In-house testing means the same company synthesizing the peptide is also verifying its quality—a conflict of interest that incentivize
This comparison does not assign a generated winner or score.
- Every peptide supplier provides a Certificate of Analysis (COA). The question researchers rarely ask: who generated that COA? In-house testing means the same company synthesizing the peptide is also verifying its quality—a conflict of interest that incentivizes passing marginal batches. Third-party COAs come from independent laboratories with no financial stake in whether the batch passes or fails. Real Peptides uses Colmaric Analyticals, an ISO 17025-accredited facility, for HPLC purity verification and mass spectrometry sequencing confirmation on every production batch.
- HPLC (high-performance liquid chromatography) separates peptides by molecular characteristics, producing a chromatogram that shows the main peak (target peptide) and any impurity peaks. A purity rating of 98.2% means 98.2% of the sample is the intended peptide and 1.8% is deletion sequences, truncated peptides, or synthesis byproducts. Competitors often report 'purity by area under curve' without specifying the detection wavelength or whether closely eluting impurities were resolved—both of which can inflate reported purity by 2–4 percentage points.
- Mass spectrometry directly measures molecular weight to confirm the peptide contains exactly 29 amino acids in the correct sequence. The expected molecular weight of CJC-1295 no DAC is 3367.9 Da. A reading of 3368.1 ± 0.5 Da confirms sequencing accuracy. A reading of 3295.3 Da indicates a deletion sequence (missing amino acids). We've seen competitor COAs showing correct purity but incorrect molecular weight—meaning the batch is pure, but it's the wrong peptide. Third-party verification catches this; in-house testing motivated by batch approval often doesn't.