Is Zhuoyan Lab Legit
Is Zhuoyan Lab Legit? 52 independent lab tests across 6 products, with a mixed lab record.
Written by the Peptide Vendor Reviews editorial team
Lab record: Mixed
How we rate- 52 independent tests
- 42 of 48 lots filled to label
- Median purity 99.7%
- 3 of 5 products graded D or E
Some of ZhuoYan lab's products graded D or E. The shops below tested A or B for the same peptides.
Better-tested BPC-157
ZhuoYan lab graded E. Zenith Jove Peptide ZJ's BPC-157 graded A across 10 tests.
Buy from Zenith Jove Peptide ZJAll better-tested optionsPeptide Vendor Reviews independently tests products and verifies reviews. Public methodology, no pay-to-rank.
Better-tested options
Where ZhuoYan lab 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.
ZhuoYan lab 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 ZhuoYan lab's site.
- RetatrutideAGREAT
- Tests
- 14
- Passed
- 92.9%
- GHK-CuAGREAT
- Tests
- 4
- Passed
- 100.0%
- TirzepatideDPOOR
- Tests
- 23
- Passed
- 69.6%
- IpamorelinEBAD
- Tests
- 3
- Passed
- 33.3%
- BPC-157EBAD
- Tests
- 2
- Passed
- 50.0%
- Tests
- 6
- Passed
- —
What the testing shows
Across 48 measured samples from ZhuoYan lab, 6 came in more than 5% under the quantity on the label (13%). Another 21 measured more than 5% over. Purity across 48 readings ran from 65.36% to 99.99%, median 99.7%. Samples span Jul 2025 to Sep 2026.
- Under label
- 6/48
- Median purity
- 99.7%
- Latest sample
- Sep 2026
more than 5% short
65.36%–99.99% range
first tested Jul 2025
Our read on ZhuoYan lab
35 of ZhuoYan lab's 52 graded samples passed (67%), and 100% of all samples were sent in by buyers rather than by the shop.
Results are slipping: 63% passed over the latest six months, down from 68% before.
When a sample failed, the most common reason was purity under 99.5% (12 times).
4 samples failed identity, meaning the lab could not confirm the vial held the labelled peptide.
Against the 302 shops with at least five graded tests, ZhuoYan lab's pass rate is at or above 39% of them, and it has more tests on record than 80% of them.
When and how ZhuoYan lab was tested
Samples per month. The darker part of each bar failed.
- Labs used
- Krause Analytical (30), BTLabs (15), Janoshik (2), Harrens Lab (1)
- Who sent the samples
- buyers 100%
- Batches covered
- 12 distinct batch numbers
Why ZhuoYan lab's failed samples failed
The 6 most recent failed tests, with the lab's reason.
Tirzepatide · Sep 16, 2026
the lab could not confirm it was the labelled peptide
Tirzepatide · Aug 13, 2026
the lab could not confirm it was the labelled peptide
BPC-157 · Jun 8, 2026
the lab could not confirm it was the labelled peptide
Tesamorelin · Feb 20, 2026
amount in the vial more than 35% off the label
Tesamorelin · Jan 29, 2026
purity under 99.5%
Tesamorelin · Jan 29, 2026
the lab could not confirm it was the labelled peptide
Lab testing results
Independent results across 6 products.
Individual lab tests
Date
9/30/2026
Purity
99.9%
Quantity
30 mg → 29.99 mg
Lab
Harrens Lab
Vial
No label / Silver crimp / Blue cap
Date
9/18/2026
Purity
99.99%
Quantity
50 mg → 47.55 mg
Lab
PharmLabs
Vial
No label / Silver crimp / Red cap
Date
9/16/2026
Purity
—
Quantity
—
Lab
Ichor Life Sciences
Vial
No label / Silver crimp / White cap
Date
8/13/2026
Purity
—
Quantity
—
Lab
Krause Analytical
Vial
White label / Silver crimp / White cap
Date
7/23/2026
Purity
99.5%
Quantity
100 mg → 86.4 mg
Lab
Krause Analytical
Vial
No label / Silver crimp / Clear cap
| Product | Date | Score | Purity | Quantity | Lab | COA |
|---|---|---|---|---|---|---|
| RetatrutideNo label / Silver crimp / Blue cap | 9/30/2026 | 10.0 | 99.9% | 30 mg → 29.99 mg | Harrens Lab | View |
| TirzepatideNo label / Silver crimp / Red cap | 9/18/2026 | 10.0 | 99.99% | 50 mg → 47.55 mg | PharmLabs | View |
| TirzepatideNo label / Silver crimp / White cap | 9/16/2026 | — | — | Ichor Life Sciences | View | |
| TirzepatideWhite label / Silver crimp / White cap | 8/13/2026 | — | — | Krause Analytical | View | |
| GHK-CuNo label / Silver crimp / Clear cap | 7/23/2026 | 9.9 | 99.5% | 100 mg → 86.4 mg | Krause Analytical | View |
Which ZhuoYan lab products tested best
GHK-Cu and Retatrutide have the strongest record, graded A or B.
Tirzepatide, BPC-157 and Ipamorelin graded D or E: a large share of their samples missed purity or quantity thresholds.
Buying from ZhuoYan lab
If you order from ZhuoYan lab, 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 ZhuoYan lab's prices yet. Shipping, payment and refund terms are on their site.
The official store is www.zyzhuoyanlab.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 ZhuoYan lab
Create a free account to save this vendor, get alerts for new lab tests, and watch price changes.
ZhuoYan lab: common questions
Is ZhuoYan lab legit?
We rate lab records, not businesses. Mixed lab record: 52 independent tests, 42 of 48 lots filled to label, median purity 99.7%, 3 of 5 products graded D or E. Each result links to its original certificate in the table above.
What do ZhuoYan lab reviews say?
We don't hold scored customer reviews for ZhuoYan lab yet. The independent lab results on this page are the evidence we have.
Which ZhuoYan lab peptides tested best?
We have graded 5 ZhuoYan lab products. GHK-Cu and Retatrutide graded A or B. Tirzepatide, BPC-157 and Ipamorelin graded D or E.
Is there a ZhuoYan lab coupon code?
We don't have a verified ZhuoYan lab coupon code. A discount changes the price, not what is in the vial.
Ordering from ZhuoYan lab?
Mixed lab record: 52 independent tests, 42 of 48 lots filled to label, median purity 99.7%, 3 of 5 products graded D or E.
About ZhuoYan lab
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