Tirz Peptide reviews
Tirz Peptide reviews: 8 independent lab tests across 2 products, with a limited lab record.
Written by the Peptide Vendor Reviews editorial team
Is Tirz Peptide legit? Lab record: Limited
How we rate- 8 independent tests
- 4 of 8 lots filled to label
- Median purity 99.9%
- 1 of 2 products graded D or E
Some of Tirz Peptide's products graded D or E. The shops below tested A or B for the same peptides.
Better-tested Tirzepatide
Tirz Peptide graded D. Paradigm Peptide's Tirzepatide graded A across 10 tests, $4.97 / mg.
Buy from Paradigm PeptideAll better-tested optionsPeptide Vendor Reviews independently tests products and verifies reviews. Public methodology, no pay-to-rank.
Better-tested options
Where Tirz Peptide graded D or E, these shops' samples of the same peptide graded A or B. Ordered by grade, then price per mg. Partner status never changes the order.
Tirzepatide
Tirz Peptide: grade DTirz Peptide products we've tested
Best-graded first. Grades come from the share of each product's samples that passed purity and quantity checks. Buy links open Tirz Peptide's site.
- RetatrutideAGREAT
- Tests
- 5
- Passed
- 100.0%
- TirzepatideDPOOR
- Tests
- 3
- Passed
- 66.7%
What the testing shows
Across 8 measured samples from Tirz Peptide, 4 came in more than 5% under the quantity on the label (50%). Another 2 measured more than 5% over. Purity across 8 readings ran from 94.41% to 99.9%, median 99.9%. Samples span Jan 2026 to Sep 2026.
- Under label
- 4/8
- Median purity
- 99.9%
- Latest sample
- Sep 2026
more than 5% short
94.41%–99.9% range
first tested Jan 2026
Our read on Tirz Peptide
7 of Tirz Peptide's 8 graded samples passed (88%), and 100% of all samples were sent in by buyers rather than by the shop.
Results are improving: 100% passed over the latest six months, up from 75% before.
When a sample failed, the most common reason was purity under 99.5% (1 time).
Against the 302 shops with at least five graded tests, Tirz Peptide's pass rate is at or above 85% of them, and it has more tests on record than 22% of them.
When and how Tirz Peptide was tested
Samples per month. The darker part of each bar failed.
- Labs used
- Krause Analytical (7), BTLabs (1)
- Who sent the samples
- buyers 100%
- Batches covered
- 3 distinct batch numbers; 2 checked for endotoxins
Why Tirz Peptide's failed samples failed
The only failed test, with the lab's reason.
Tirzepatide · Jan 22, 2026
purity under 99.5%
Lab testing results
Independent results across 2 products.
Individual lab tests
Date
9/24/2026
Purity
99.9%
Quantity
20 mg → 18.3 mg
Lab
Krause Analytical
Vial
White label / Silver crimp / Blue cap
Date
8/25/2026
Purity
99.9%
Quantity
60 mg → 67.2 mg
Lab
BTLabs
Vial
White Label / Copper Crimp / Clear Cap
Date
8/4/2026
Purity
99.9%
Quantity
10 mg → 7.26 mg
Lab
Krause Analytical
Vial
No label / Silver crimp / Black cap
Date
4/23/2026
Purity
99.9%
Quantity
30 mg → 33.3 mg
Lab
Krause Analytical
Vial
No Label / Silver Crimp / Purple Cap
Date
3/4/2026
Purity
99.79%
Quantity
5 mg → 4.21 mg
Lab
Krause Analytical
Vial
No Label / Silver Crimp / Violet Cap
| Product | Date | Score | Purity | Quantity | Lab | COA |
|---|---|---|---|---|---|---|
| RetatrutideWhite label / Silver crimp / Blue cap | 9/24/2026 | 10.0 | 99.9% | 20 mg → 18.3 mg | Krause Analytical | View |
| TirzepatideWhite Label / Copper Crimp / Clear Cap | 8/25/2026 | 10.0 | 99.9% | 60 mg → 67.2 mg | BTLabs | View |
| RetatrutideNo label / Silver crimp / Black cap | 8/4/2026 | 10.0 | 99.9% | 10 mg → 7.26 mg | Krause Analytical | View |
| RetatrutideNo Label / Silver Crimp / Purple Cap | 4/23/2026 | 10.0 | 99.9% | 30 mg → 33.3 mg | Krause Analytical | View |
| TirzepatideNo Label / Silver Crimp / Violet Cap | 3/4/2026 | 10.0 | 99.79% | 5 mg → 4.21 mg | Krause Analytical | View |
Which Tirz Peptide products tested best
Retatrutide has the strongest record, graded A or B.
Tirzepatide graded D or E: a large share of its samples missed purity or quantity thresholds.
Buying from Tirz Peptide
If you order from Tirz Peptide, the A- and B-graded products are the safer picks on this record. For the weaker ones, the better-tested options on this page come from other shops.
We don't track Tirz Peptide's prices yet. Shipping, payment and refund terms are on their site.
The official store is www.tirz-peptide.com. Check the address before you pay.
What to check before you pay
- The lot number on the vial matches the certificate
- The certificate names the lab and the test date
- Fill versus label, not purity alone
- A refund policy in writing
Track Tirz Peptide
Create a free account to save this vendor, get alerts for new lab tests, and watch price changes.
Tirz Peptide: common questions
Is Tirz Peptide legit?
We rate lab records, not businesses. Limited lab record: 8 independent tests, 4 of 8 lots filled to label, median purity 99.9%, 1 of 2 products graded D or E. Each result links to its original certificate in the table above.
What do Tirz Peptide reviews say?
We don't hold scored customer reviews for Tirz Peptide yet. The independent lab results on this page are the evidence we have.
Which Tirz Peptide peptides tested best?
We have graded 2 Tirz Peptide products. Retatrutide graded A or B. Tirzepatide graded D or E.
Is there a Tirz Peptide coupon code?
We don't have a verified Tirz Peptide coupon code. A discount changes the price, not what is in the vial.
Ordering from Tirz Peptide?
Limited lab record: 8 independent tests, 4 of 8 lots filled to label, median purity 99.9%, 1 of 2 products graded D or E.