Cocer Peptides reviews
Cocer Peptides reviews: 13 independent lab tests across 3 products, with a mixed lab record.
Written by the Peptide Vendor Reviews editorial team
Is Cocer Peptides legit? Lab record: Mixed
How we rate- 13 independent tests
- 11 of 11 lots filled to label
- Median purity 99.8%
- 3 of 3 products graded D or E
Some of Cocer Peptides's products graded D or E. The shops below tested A or B for the same peptides.
Better-tested Tesamorelin
Cocer Peptides graded E. Shanghai ERP peptide Biotechnology's Tesamorelin graded A across 13 tests.
Buy from Shanghai ERP peptide BiotechnologyAll better-tested optionsPeptide Vendor Reviews independently tests products and verifies reviews. Public methodology, no pay-to-rank.
Better-tested options
Where Cocer 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.
Cocer 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 Cocer Peptides' site.
- RetatrutideDPOOR
- Tests
- 6
- Passed
- 66.7%
- TesamorelinEBAD
- Tests
- 4
- Passed
- 50.0%
- TB-500EBAD
- Tests
- 3
- Passed
- 33.3%
What the testing shows
Across 11 measured samples from Cocer Peptides, 0 came in more than 5% under the quantity on the label (0%). Another 6 measured more than 5% over. Purity across 12 readings ran from 97.8% to 99.95%, median 99.8%. Samples span Oct 2025 to Sep 2026.
- Under label
- 0/11
- Median purity
- 99.8%
- Latest sample
- Sep 2026
- Ships from
- China
more than 5% short
97.8%–99.95% range
first tested Oct 2025
per vendor listing
Our read on Cocer Peptides
7 of Cocer Peptides' 13 graded samples passed (54%), and 100% of all samples were sent in by buyers rather than by the shop.
Results are slipping: 33% passed over the latest six months, down from 60% before.
When a sample failed, the most common reason was amount in the vial more than 35% off the label (3 times).
1 sample failed identity, meaning the lab could not confirm the vial held the labelled peptide.
Against the 302 shops with at least five graded tests, Cocer Peptides' pass rate is at or above 19% of them, and it has more tests on record than 40% of them.
When and how Cocer Peptides was tested
Samples per month. The darker part of each bar failed.
- Labs used
- BTLabs (6), Krause Analytical (6), Harrens Lab (1)
- Who sent the samples
- buyers 100%
- Batches covered
- 8 distinct batch numbers
Why Cocer Peptides' failed samples failed
The 6 most recent failed tests, with the lab's reason.
Retatrutide · Jun 16, 2026
the lab could not confirm it was the labelled peptide
Tesamorelin · Jun 8, 2026
amount in the vial more than 35% off the label
TB-500 Thymosin Beta-4 · Mar 12, 2026
purity under 99.5%
TB-500 Thymosin Beta-4 · Feb 18, 2026
purity under 99.5%
Tesamorelin · Feb 4, 2026
amount in the vial more than 35% off the label
Retatrutide · Jan 15, 2026
amount in the vial more than 35% off the label
Lab testing results
Independent results across 3 products.
Individual lab tests
Date
9/30/2026
Purity
99.9%
Quantity
20 mg → 19.99 mg
Lab
Harrens Lab
Vial
No label / Black crimp / Clear Green cap
Date
6/16/2026
Purity
—
Quantity
—
Lab
BTLabs
Vial
White label / Silver crimp / Blue cap
Date
6/8/2026
Purity
99.8%
Quantity
20 mg → 28.4 mg
Lab
BTLabs
Vial
No label / Black crimp / Blue cap
Date
3/12/2026
Purity
99.9%
Quantity
10 mg → 10.4 mg
Lab
Krause Analytical
Vial
White Label / Silver Crimp / Black Cap
Date
3/12/2026
Purity
97.8%
Quantity
10 mg → 10.3 mg
Lab
Krause Analytical
Vial
White Label / Copper Crimp / Clear Green Cap
| Product | Date | Score | Purity | Quantity | Lab | COA |
|---|---|---|---|---|---|---|
| RetatrutideNo label / Black crimp / Clear Green cap | 9/30/2026 | 10.0 | 99.9% | 20 mg → 19.99 mg | Harrens Lab | View |
| RetatrutideWhite label / Silver crimp / Blue cap | 6/16/2026 | — | — | BTLabs | View | |
| TesamorelinNo label / Black crimp / Blue cap | 6/8/2026 | 10.0 | 99.8% | 20 mg → 28.4 mg | BTLabs | View |
| TesamorelinWhite Label / Silver Crimp / Black Cap | 3/12/2026 | 10.0 | 99.9% | 10 mg → 10.4 mg | Krause Analytical | View |
| TB-500White Label / Copper Crimp / Clear Green Cap | 3/12/2026 | 9.8 | 97.8% | 10 mg → 10.3 mg | Krause Analytical | View |
Which Cocer Peptides products tested best
Retatrutide, Tesamorelin and TB-500 graded D or E: a large share of their samples missed purity or quantity thresholds.
Buying from Cocer Peptides
We don't track Cocer Peptides' prices yet. Shipping, payment and refund terms are on their site.
The official store is www.cocerpeptides.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 Cocer Peptides
Create a free account to save this vendor, get alerts for new lab tests, and watch price changes.
Cocer Peptides: common questions
Is Cocer Peptides legit?
We rate lab records, not businesses. Mixed lab record: 13 independent tests, 11 of 11 lots filled to label, median purity 99.8%, 3 of 3 products graded D or E. Each result links to its original certificate in the table above.
What do Cocer Peptides reviews say?
We don't hold scored customer reviews for Cocer Peptides yet. The independent lab results on this page are the evidence we have.
Which Cocer Peptides peptides tested best?
We have graded 3 Cocer Peptides products. Retatrutide, Tesamorelin and TB-500 graded D or E.
Is there a Cocer Peptides coupon code?
We don't have a verified Cocer Peptides coupon code. A discount changes the price, not what is in the vial.
Where does Cocer Peptides ship from?
Public listings place Cocer Peptides's shipping origin in China. Check the shop's own shipping page before ordering, as origin can change.
Ordering from Cocer Peptides?
Mixed lab record: 13 independent tests, 11 of 11 lots filled to label, median purity 99.8%, 3 of 3 products graded D or E.