If you sourced tirzepatide from Peptide Sciences, that door closed in March 2026 when the company shut down for good. Of all the compounds people are now scrambling to replace, tirzepatide is the one where you cannot afford to guess, because it is the single most counterfeited and most legally pressured compound in the space.
Why this one needs extra care
Through the 2026 vendor shakeout, tirzepatide was at the center of the trouble. It drew the heaviest legal attention, and independent testing repeatedly caught product that did not match the label. Now that the established vendors are gone, a lot of buyers are being pushed toward unfamiliar sellers at exactly the moment counterfeit risk is highest. With tirzepatide, the documentation is the whole game.
What to look for in a replacement
Before you buy from anyone, demand a per batch Certificate of Analysis you can see up front, HPLC purity on the specific lot, mass spectrometry confirmation, and a lot number tied to your vial. A claim of high purity with no lab report behind it is not enough for this compound.
Where to source tirzepatide now
Peptide Hackers carries tirzepatide with that documentation on every order. Recent lots have come back at 99.505% HPLC verified purity, a reading on a real lot rather than a round marketing figure.
It also removes the prepay risk that left Peptide Sciences customers stranded. You can pick it up the same day in person in Los Angeles or Newport Beach, see the product, get the paperwork in hand, and pay at the counter. For the full picture on the shutdown, see our Peptide Sciences breakdown.
All products are for laboratory research only. Not for human or veterinary use.
Research Use Only
This article is provided for educational purposes. All peptides discussed are sold for research use only and are not intended for human consumption or therapeutic use.