PureRawz tested at 91% purity on Janoshik — below acceptable threshold

Dr.EM_Chicago said:

They are not contradictory, they measure different things, and this is the single most common misreading of a certificate.

Genuinely useful, thank you. I had the facts and not the framework. I will report back once I have actually tried it.

From the other side of the consultation, briefly.

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.

Dr.SleepRoch said:

Community-verified vendors for certificates of analysis: I maintain a spreadsheet of Janoshik-verified test results submitted by community members.

My HPLC chromatogram analysis for certificates of analysis — I sent my batch to Janoshik and here's what the results showed:

Main peak retention time: 15.5 minutes (consistent with semaglutide reference standard)
Peak purity: 99.7%
Related substances: 0.4% (single impurity at 9.1 minutes — likely a synthesis intermediate)
Mass spec: m/z 4113.6 (matches expected molecular weight)

This is a clean result. The mass spec confirmation is particularly important — it proves the molecule is actually semaglutide and not a substitution.

PurityPaulOR said:

I have a certificate reporting 99.2% purity and 6.1mg content on a vial sold as 5mg, and I cannot work out whether those two numbers are consistent or…

My vendor review relevant to certificates of analysis: ordered 4 times from my current compounder. Consistency has been excellent.

Shipping: 2-day priority with gel ice
Packaging: Professional, discreet, proper labeling with lot/batch numbers
Purity: 98.1% average across orders (Janoshik verified)
Customer service: Responsive within 4 hours
Price: $137/month for tirzepatide 10mg equivalent

Moderator note: the sourcing question belongs in the vendor section and has been split out. Carry on.