Identity confirmed by mass spectrometry, purity measured, and the milligrams of peptide actually in your vial reported as a separate figure. Analyzed in Ontario — your sample never crosses a border.
$249CAD
Results in about five business days from arrival
Order this testA 39-residue synthetic peptide carrying a C20 fatty diacid attached through a PEG spacer at Lys20. That acylation is the most demanding part of the synthesis, and it is where a sample most often diverges from its label.
Tirzepatide is expensive to synthesise. Semaglutide is cheaper and serves the same market, which makes it the obvious thing to put in a vial labelled tirzepatide.
The two differ by roughly 700 daltons. That is a large gap by the standards of this work, and mass spectrometry separates them without difficulty — but only if the laboratory is weighing the molecule rather than timing how long it takes to travel through a column.
Retatrutide sits much closer.
4813.5 vs 4731.3
Tirzepatide against retatrutide — 82 daltons apart, about 1.7%
That is the difference between a 5 kg bag of flour and one with an extra 85 grams in it. Distinguishing them takes genuine mass accuracy, not a nominal figure. How mass spectrometry tells them apart.
13.8%
of tirzepatide samples met both criteria under the stricter manufactured-drug standard. 58.8% had acceptable purity but the wrong amount in the vial — consistent purity paired with frequent dosing inaccuracy. Tirzepatide also showed one of the three widest spreads in measured amount across vendors.
Mendias C, Awan T, 2026 — 6,441 grey-market samples across 14 compounds and 203 synthesis companies. Posted as a preprint; not peer reviewed. The dataset is self-selected third-party testing, so buyers who already suspected a problem are over-represented. Full findings and caveats.
One unopened vial. Detailed posting instructions arrive with your order confirmation, immediately after you pay.
No. Lyophilised peptides travel safely at room temperature, which is how nearly all samples reach us.
An independent Ontario laboratory. Every certificate we issue names the facility that ran it — we are a testing service, not a laboratory, and we would rather say so than let you find out from the report.
You get the result. We do not soften findings, and we do not charge differently depending on what the analysis shows.
Yes. Every certificate carries an identifier that anyone can check against our records, including the vendor you bought from.
Test your tirzepatide
$249 CAD · about five business days from arrival · never leaves Canada