claudia_zurich said:

I tested my certificates of analysis batch through Janoshik — 98.1% purity.

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.

ricardo_MIA said:

One addition: an unstated method makes a report close to uninterpretable.

Genuinely useful, thank you. I had the facts and not the framework. Printing the relevant bit and taking it with me.

claudia_zurich said:

I tested my certificates of analysis batch through Janoshik — 98.1% purity.

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

• Janoshik: Gold standard for peptide community, ~$136, 10-14 day turnaround
• Valitech: US-based, ISO 17025 accredited, ~$216
• Eurofins: Full pharmaceutical testing suite, more expensive but comprehensive
• ChemTox: Basic identity and purity testing, ~$106

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.

SarahChen_PharmD said:

Two reports on the same product from two laboratories, four percentage points apart, and no method stated on either.

My vendor review relevant to certificates of analysis: ordered 3 times from my current compounder. Consistency has been excellent.

Shipping: Next-day with cold pack
Packaging: Professional, discreet, proper labeling with lot/batch numbers
Purity: 97.0% average across orders (Janoshik verified)
Customer service: Responsive within 2 hours
Price: $128/month for semaglutide 2.4mg equivalent

Moderator note: leaving this open. It is being argued well and the disagreement is the useful part. Tagging this one for the weekly digest.