Receipt No. 001
Research compounds, with receipts.
Plain English guides to lab reports, testing methods and the published science behind research compounds. No hype. Just the paperwork.
What a real receipt proves
Three questions every COA has to answer.
Is it the right compound?
Mass spectrometry compares the observed molecular weight with the expected one.
How pure is it?
HPLC separates the sample and reports the target’s share of the total.
Is the amount right?
Net content testing confirms the vial holds what the label says.
Latest guides
Read before you trust a label.
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HPLC vs Mass Spectrometry: What Each Lab Test Actually Proves
One test tells you how pure a sample is. The other tells you what it actually is. Here is why a real COA needs both.
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How to Read a Certificate of Analysis (COA): A Line by Line Guide
A COA is the receipt for a research compound. Here is what every line means, and the five red flags that should make you walk away.
Why this site exists
Anyone can print a label. Few show the paperwork.
Offline Receipts explains how research compounds are tested and how to check the reports yourself. Every article is written to be read in a few minutes, cites its sources, and sticks to what the lab data shows.
For educational purposes only. Not medical advice. Compounds discussed are for laboratory research use only.