Checkmate Peptides reviews
Checkmate Peptides reviews: 6 independent lab tests across 2 products, with a limited lab record.
Written by the Peptide Vendor Reviews editorial team
Is Checkmate Peptides legit? Lab record: Limited
How we rate- 6 independent tests
- 2 of 4 lots filled to label
- Median purity 99.9%
- 2 of 2 products graded D or E
Some of Checkmate Peptides's products graded D or E. The shops below tested A or B for the same peptides.
Better-tested Tirzepatide
Checkmate Peptides 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 Checkmate Peptides 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
Checkmate Peptides: grade DRetatrutide
Checkmate Peptides: grade DCheckmate Peptides 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 Checkmate Peptides' site.
- TirzepatideDPOOR
- Tests
- 3
- Passed
- 66.7%
- RetatrutideDPOOR
- Tests
- 3
- Passed
- 66.7%
What the testing shows
Across 4 measured samples from Checkmate Peptides, 2 came in more than 5% under the quantity on the label (50%). Purity across 4 readings ran from 99.9% to 99.9%, median 99.9%. Samples span May 2026 to Jul 2026.
- Under label
- 2/4
- Median purity
- 99.9%
- Latest sample
- Jul 2026
more than 5% short
99.9%–99.9% range
first tested May 2026
Our read on Checkmate Peptides
4 of Checkmate Peptides' 6 graded samples passed (67%), and 100% of all samples were sent in by buyers rather than by the shop.
When a sample failed, the most common reason was the lab could not confirm it was the labelled peptide (2 times).
Against the 302 shops with at least five graded tests, Checkmate Peptides' pass rate is at or above 37% of them, and it has more tests on record than 9% of them.
When and how Checkmate Peptides was tested
Samples per month. The darker part of each bar failed.
- Labs used
- Krause Analytical (6)
- Who sent the samples
- buyers 100%
- Batches covered
- 6 distinct batch numbers
Why Checkmate Peptides' failed samples failed
The 2 most recent failed tests, with the lab's reason.
Retatrutide · Jul 1, 2026
the lab could not confirm it was the labelled peptide
Tirzepatide · Jul 1, 2026
the lab could not confirm it was the labelled peptide
Lab testing results
Independent results across 2 products.
Individual lab tests
Date
7/1/2026
Purity
—
Quantity
—
Lab
Krause Analytical
Vial
No label / Gold crimp / Clear cap
Date
7/1/2026
Purity
—
Quantity
—
Lab
Krause Analytical
Vial
No label / Gold crimp / Clear cap
Date
6/26/2026
Purity
99.9%
Quantity
30 mg → 25.4 mg
Lab
Krause Analytical
Vial
White label / Silver crimp / Red cap
Date
6/24/2026
Purity
99.9%
Quantity
30 mg → 26.5 mg
Lab
Krause Analytical
Vial
White label / Silver crimp / Orange cap
Date
5/13/2026
Purity
99.9%
Quantity
30 mg → 30 mg
Lab
Krause Analytical
Vial
No label / Silver crimp / Yellow cap
| Product | Date | Score | Purity | Quantity | Lab | COA |
|---|---|---|---|---|---|---|
| TirzepatideNo label / Gold crimp / Clear cap | 7/1/2026 | — | — | Krause Analytical | View | |
| RetatrutideNo label / Gold crimp / Clear cap | 7/1/2026 | — | — | Krause Analytical | View | |
| TirzepatideWhite label / Silver crimp / Red cap | 6/26/2026 | 10.0 | 99.9% | 30 mg → 25.4 mg | Krause Analytical | View |
| RetatrutideWhite label / Silver crimp / Orange cap | 6/24/2026 | 10.0 | 99.9% | 30 mg → 26.5 mg | Krause Analytical | View |
| TirzepatideNo label / Silver crimp / Yellow cap | 5/13/2026 | 10.0 | 99.9% | 30 mg → 30 mg | Krause Analytical | View |
Which Checkmate Peptides products tested best
Tirzepatide and Retatrutide graded D or E: a large share of their samples missed purity or quantity thresholds.
Buying from Checkmate Peptides
We don't track Checkmate Peptides' prices yet. Shipping, payment and refund terms are on their site.
The official store is checkmatepeptides.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 Checkmate Peptides
Create a free account to save this vendor, get alerts for new lab tests, and watch price changes.
Checkmate Peptides: common questions
Is Checkmate Peptides legit?
We rate lab records, not businesses. Limited lab record: 6 independent tests, 2 of 4 lots filled to label, median purity 99.9%, 2 of 2 products graded D or E. Each result links to its original certificate in the table above.
What do Checkmate Peptides reviews say?
We don't hold scored customer reviews for Checkmate Peptides yet. The independent lab results on this page are the evidence we have.
Which Checkmate Peptides peptides tested best?
We have graded 2 Checkmate Peptides products. Tirzepatide and Retatrutide graded D or E.
Is there a Checkmate Peptides coupon code?
We don't have a verified Checkmate Peptides coupon code. A discount changes the price, not what is in the vial.
Ordering from Checkmate Peptides?
Limited lab record: 6 independent tests, 2 of 4 lots filled to label, median purity 99.9%, 2 of 2 products graded D or E.