Has anyone dealt with janoshik vs in-house testing?

PeptideChemSF said:

HPLC results interpretation for certificates of analysis: when you get your Janoshik report back, here's what the numbers mean: Purity %: Should be…

This is my experience too, for whatever a second data point is worth.

PeptideChemSF said:

HPLC results interpretation for certificates of analysis: when you get your Janoshik report back, here's what the numbers mean: Purity %: Should be…

Third-party testing services for certificates of analysis besides Janoshik:

• Janoshik: Gold standard for peptide community, ~$150, 10-14 day turnaround
• Valitech: US-based, ISO 17025 accredited, ~$230
• Eurofins: Full pharmaceutical testing suite, more expensive but comprehensive
• ChemTox: Basic identity and purity testing, ~$120

Janoshik is the community standard but any ISO-accredited analytical lab can verify peptide identity and purity. The key is independence — don't rely solely on the vendor's own testing.

The figures, for anyone assembling their own picture. Worth stating the units and the reference range whenever you post a number here. A large fraction of the apparent disagreement in these threads is two people using different units and both being right.

Following on from PeptideChemSF — and this may be the naive question:

How long did you give it before you decided it was working?

DoseLogDan said:

Worth stating the units and the reference range whenever you post a number here.

Pushing back on DoseLogDan here. Pushing back on the consensus forming here. Consistency is not the same as correctness, and a board that agrees with itself quickly is usually agreeing with the first person who sounded certain.