Penguin Peptides
Tirzepatide
Finnrick tested 6 samples of Tirzepatide (GLP-1 and GIP agonist) from Penguin Peptides between 23 Oct 2025 and 6 Aug 2026. Test scores average over 6, no score below 5, and at least 6 tests warrant a confident Finnrick Rating of B (Good).
Finnrick Rating™
Penguin Peptides
Tirzepatide
Tested 6 Samples
Last test 6 Aug 2026
Take Action
Free peptide testing
Mail in a sample (US only) to get confidence for the specific vials you have, and contribute to identifying unsafe supply chains, so other people can avoid risky and costly mistakes.
Other Tirzepatide tests from top-rated vendors:
All Tirzepatide tests from Penguin Peptides
Samples are tested in commercial labs
Tests Count
6
Scores
AVGMINMAX
Last
6 Aug 2026
First
23 Oct 2025
| Quantity | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Test Date | Certificate | Test Score | Label | Tested | Difference | Purity | Endotoxins | Batch ID | Container | Tested At | Sent By |
| 6 Aug 2026 | View | 20mg | 40.6mg | +103.0% | 99.90% | n/a | 09/03/2027 | No label, Silver crimp, Green cap | Lab G | Public | |
| 16 Jun 2026 | View | 5mg | 4.78mg | -4.4% | 99.90% | below LOQ | (no batch ID) | White label / Silver crimp / Blue cap | Lab E | Public | |
| 1 Jun 2026 | View | 60mg | 59.6mg | -0.7% | 99.90% | below LOQ | (no batch ID) | White label / Copper crimp / Clear cap | Lab E | Public | |
| 4 Mar 2026 | View | 5mg | 4.96mg | -0.8% | 98.90% | n/a | (no batch ID) | White Label / Silver Crimp / Blue Cap | Lab E | Public | |
| 19 Jan 2026 | View | 5mg | 5.09mg | +1.8% | 99.95% | n/a | (no batch ID) | White Label / Silver Crimp / Blue Cap | Lab E | Public | |
| 23 Oct 2025 | View | 50mg | 53.6mg | +7.2% | 99.95% | n/a | (no batch ID) | White Label / Silver Crimp / Red Cap | Lab E | Public | |