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Peptide Testing Dates Explained: How Recent Should a COA Be?
You're comparing peptide vendors and you notice something: one company's Certificate of Analysis is dated last week, another's is from six months ago. Does it matter? The short answer is yes, but prob
What Does 99% Peptide Purity Actually Mean?
You've seen the number everywhere. Every research peptide vendor seems to claim "99% purity" on their products. But what does that actually tell you? And more importantly, what doesn't it tell you?
HPLC vs. Mass Spectrometry: What Peptide Testing Actually Measures
When you see a Certificate of Analysis claiming 99% purity, what does that number actually represent? The answer depends entirely on which testing method was used. Understanding the difference between
How to Verify a Peptide COA: Lab Reports, Batch Numbers and Test Results
A Certificate of Analysis is supposed to tell you exactly what you're buying. But not every COA is worth the paper it's printed on.
Why Batch Numbers Matter on Peptide COAs
A Certificate of Analysis without a batch number is like a receipt without a date. It might look official, but it tells you almost nothing about what you actually received.
What a Peptide COA Doesn't Tell You
A Certificate of Analysis sits at the center of peptide quality assurance. Vendors wave them around like golden tickets, and buyers treat them as the final word on whether a product is legitimate. But
What Is Independent Peptide Batch Testing and Why Does It Matter?
The research peptide market has a transparency problem. When you order a compound online, you're often trusting a certificate of analysis (CoA) that the vendor themselves produced or commissioned. Ind
Peptide Purity vs. Quantity: What's the Difference on a COA?
If you've ever compared peptide vendors, you've probably downloaded a Certificate of Analysis. And if you've looked at more than one, you've probably noticed something: the numbers can be confusing.
Why Peptide Testing Dates Matter
When you're comparing research peptides across vendors, price and purity percentages grab your attention first. But there's a third variable that deserves equal consideration: when was that purity tes
Can You Trust a Peptide Vendor's COA?
A Certificate of Analysis is supposed to be your proof that a peptide is what the vendor claims. But here's the uncomfortable question most buyers eventually ask: how do you know the COA itself is leg
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