Zen Peptides reviews
Zen Peptides reviews: 35 independent lab tests across 7 products, with a mixed lab record.
Written by the Peptide Vendor Reviews editorial team
Is Zen Peptides legit? Lab record: Mixed
How we rate- 35 independent tests
- 24 of 33 lots filled to label
- Median purity 99.78%
- 5 of 7 products graded D or E
Some of Zen Peptides's products graded D or E. The shops below tested A or B for the same peptides.
Better-tested Tesamorelin
Zen 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 Zen 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.
Tesamorelin
Zen Peptides: grade ENAD+
Zen Peptides: grade DBPC-157
Zen Peptides: grade DZen 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 Zen Peptides' site.
- GHK-CuAGREAT
- Tests
- 4
- Passed
- 100.0%
- TirzepatideBGOOD
- Tests
- 5
- Passed
- 80.0%
- RetatrutideDPOOR
- Tests
- 11
- Passed
- 63.6%
- NAD+DPOOR
- Tests
- 3
- Passed
- 66.7%
- BPC-157DPOOR
- Tests
- 3
- Passed
- 66.7%
- IpamorelinDPOOR
- Tests
- 3
- Passed
- 66.7%
- TesamorelinEBAD
- Tests
- 6
- Passed
- 33.3%
What the testing shows
Across 33 measured samples from Zen Peptides, 9 came in more than 5% under the quantity on the label (27%). Another 10 measured more than 5% over. Purity across 34 readings ran from 85.72% to 99.95%, median 99.78%. Samples span Aug 2025 to Sep 2026.
- Under label
- 9/33
- Median purity
- 99.78%
- Latest sample
- Sep 2026
- Ships from
- Singapore
more than 5% short
85.72%–99.95% range
first tested Aug 2025
per vendor listing
Our read on Zen Peptides
23 of Zen Peptides' 35 graded samples passed (66%), and 100% of all samples were sent in by buyers rather than by the shop.
The pass rate has held steady: 67% over the latest six months against 66% before.
When a sample failed, the most common reason was purity under 99.5% (8 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, Zen Peptides' pass rate is at or above 32% of them, and it has more tests on record than 68% of them.
When and how Zen Peptides was tested
Samples per month. The darker part of each bar failed.
- Labs used
- Krause Analytical (23), BTLabs (12)
- Who sent the samples
- buyers 100%
- Batches covered
- 9 distinct batch numbers; 7 checked for endotoxins
Why Zen Peptides' failed samples failed
The 6 most recent failed tests, with the lab's reason.
Retatrutide · Jul 20, 2026
the lab could not confirm it was the labelled peptide
NAD+ · Mar 1, 2026
amount in the vial more than 35% off the label
Tesamorelin · Feb 19, 2026
purity under 99.5%
Tesamorelin · Jan 19, 2026
purity under 99.5%
Tirzepatide · Dec 13, 2025
amount in the vial more than 35% off the label
Retatrutide · Dec 10, 2025
purity under 99.5%
Lab testing results
Independent results across 7 products.
Individual lab tests
Date
9/24/2026
Purity
99.9%
Quantity
20 mg → 18.9 mg
Lab
Krause Analytical
Vial
White label / Copper crimp / Clear cap
Date
9/24/2026
Purity
99.9%
Quantity
60 mg → 52 mg
Lab
Krause Analytical
Vial
White label / Silver crimp / Blue cap
Date
7/20/2026
Purity
—
Quantity
—
Lab
BTLabs
Vial
No label / Silver crimp / Black cap
Date
3/18/2026
Purity
99.5%
Quantity
1000 mg → 1340 mg
Lab
Krause Analytical
Vial
No Label / Copper Crimp / Clear Cap
Date
3/4/2026
Purity
99.9%
Quantity
60 mg → 59.7 mg
Lab
Krause Analytical
Vial
Silver Label / Copper Crimp / Clear Cap
| Product | Date | Score | Purity | Quantity | Lab | COA |
|---|---|---|---|---|---|---|
| RetatrutideWhite label / Copper crimp / Clear cap | 9/24/2026 | 10.0 | 99.9% | 20 mg → 18.9 mg | Krause Analytical | View |
| TirzepatideWhite label / Silver crimp / Blue cap | 9/24/2026 | 10.0 | 99.9% | 60 mg → 52 mg | Krause Analytical | View |
| RetatrutideNo label / Silver crimp / Black cap | 7/20/2026 | — | — | BTLabs | View | |
| NAD+No Label / Copper Crimp / Clear Cap | 3/18/2026 | 9.9 | 99.5% | 1000 mg → 1340 mg | Krause Analytical | View |
| TirzepatideSilver Label / Copper Crimp / Clear Cap | 3/4/2026 | 10.0 | 99.9% | 60 mg → 59.7 mg | Krause Analytical | View |
Which Zen Peptides products tested best
GHK-Cu and Tirzepatide have the strongest record, graded A or B.
NAD+, BPC-157, Ipamorelin, Retatrutide and Tesamorelin graded D or E: a large share of their samples missed purity or quantity thresholds.
Buying from Zen Peptides
If you order from Zen Peptides, 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 Zen Peptides' prices yet. Shipping, payment and refund terms are on their site.
The official store is zen-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 Zen Peptides
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Zen Peptides: common questions
Is Zen Peptides legit?
We rate lab records, not businesses. Mixed lab record: 35 independent tests, 24 of 33 lots filled to label, median purity 99.78%, 5 of 7 products graded D or E. Each result links to its original certificate in the table above.
What do Zen Peptides reviews say?
We don't hold scored customer reviews for Zen Peptides yet. The independent lab results on this page are the evidence we have.
Which Zen Peptides peptides tested best?
We have graded 7 Zen Peptides products. GHK-Cu and Tirzepatide graded A or B. NAD+, BPC-157, Ipamorelin, Retatrutide and Tesamorelin graded D or E.
Is there a Zen Peptides coupon code?
We don't have a verified Zen Peptides coupon code. A discount changes the price, not what is in the vial.
Where does Zen Peptides ship from?
Public listings place Zen Peptides's shipping origin in Singapore. Check the shop's own shipping page before ordering, as origin can change.
Ordering from Zen Peptides?
Mixed lab record: 35 independent tests, 24 of 33 lots filled to label, median purity 99.78%, 5 of 7 products graded D or E.
Contact
- Singapore
- zen-peptide.com