Dr.PainCLE said:

Vendor quality matters when discussing certificates of analysis.

Can confirm. Same sequence, different timescale. Posting only so the count is not one.

Adding the clinical framing, because it changes how the question reads.

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

• Janoshik: Gold standard for peptide community, ~$125, 10-14 day turnaround
• Valitech: US-based, ISO 17025 accredited, ~$205
• Eurofins: Full pharmaceutical testing suite, more expensive but comprehensive
• ChemTox: Basic identity and purity testing, ~$105

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.

Dr.NateNeph said:

Third-party testing services for certificates of analysis besides Janoshik: Janoshik: Gold standard for peptide community, ~$125, 10-14 day turnaround…

Adding a me-too, because a thread of one person's experience is not much use. Nothing to add that would improve it.

Dr.NateNeph said:

Third-party testing services for certificates of analysis besides Janoshik: Janoshik: Gold standard for peptide community, ~$125, 10-14 day turnaround…

COA red flags for certificates of analysis — here's what to look for when reviewing a Certificate of Analysis:

• No HPLC data: If there's no chromatography graph, it's not a real COA
• Exact 100% purity: Suspicious — real testing always shows slight variation
• No batch number: Can't trace back to specific production
• No endotoxin testing: For injectables, this is essential
• Template looks like it was made in Word: Professional labs have standardized formats

I have seen fake COAs that are literally photoshopped. Always verify independently if possible.

Moderator note: leaving this open. It is being argued well and the disagreement is the useful part.