Zztai Peptides Reviews
Zztai Peptides review: 41 independent lab tests across 5 products, with a mixed lab record.
Written by the Peptide Vendor Reviews editorial team
Is Zztai Peptide legit? Lab record: Mixed
How we rate- 41 independent tests
- 26 of 40 lots filled to label
- Median purity 99.75%
- All 5 products graded C or better
Opens the vendor's site. We don't earn from this link, and no one pays to rank.
Vendor website
Visit Zztai Peptide
41 independent COAs · not paid-to-rank · 14 of 40 lots under label
Visit Zztai PeptideOpens the vendor site. No partner discount on this shop.
Peptide Vendor Reviews independently tests products and verifies reviews. Public methodology, no pay-to-rank.
Zztai 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 Zztai Peptide's site.
- GHK-CuAGREAT
- Tests
- 4
- Passed
- 100.0%
- TesamorelinAGREAT
- Tests
- 3
- Passed
- 100.0%
- Melanotan IIAGREAT
- Tests
- 2
- Passed
- 100.0%
- RetatrutideBGOOD
- Tests
- 12
- Passed
- 83.3%
- TirzepatideCOKAY
- Tests
- 20
- Passed
- 70.0%
What the testing shows
Across 40 measured samples from Zztai Peptide, 14 came in more than 5% under the quantity on the label (35%). Another 10 measured more than 5% over. Purity across 40 readings ran from 96.63% to 99.95%, median 99.75%. Samples span Jun 2025 to Sep 2026.
- Under label
- 14/40
- Median purity
- 99.75%
- Latest sample
- Sep 2026
- Ships from
- Guangdong
more than 5% short
96.63%–99.95% range
first tested Jun 2025
per vendor listing
Our read on Zztai Peptide
33 of Zztai Peptide's 41 graded samples passed (80%), and 100% of all samples were sent in by buyers rather than by the shop.
When a sample failed, the most common reason was purity under 99.5% (6 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, Zztai Peptide's pass rate is at or above 71% of them, and it has more tests on record than 73% of them.
When and how Zztai Peptide was tested
Samples per month. The darker part of each bar failed.
- Labs used
- Krause Analytical (27), BTLabs (13), Chromate (1)
- Who sent the samples
- buyers 100%
- Batches covered
- 8 distinct batch numbers
Why Zztai Peptide's failed samples failed
The 6 most recent failed tests, with the lab's reason.
Retatrutide · Sep 7, 2026
the lab could not confirm it was the labelled peptide
Tirzepatide · Dec 13, 2025
amount in the vial more than 35% off the label
Retatrutide · Sep 4, 2025
purity under 99.5%
Tirzepatide · Aug 31, 2025
purity under 99.5%
Tirzepatide · Aug 28, 2025
purity under 99.5%
Tirzepatide · Aug 5, 2025
purity under 99.5%
Lab testing results
Independent results across 5 products.
Individual lab tests
Date
9/7/2026
Purity
—
Quantity
—
Lab
BTLabs
Vial
No label / Silver crimp / Blue cap
Date
3/25/2026
Purity
99.8%
Quantity
20 mg → 22 mg
Lab
BTLabs
Vial
No Label / Silver Crimp / Black Cap
Date
2/22/2026
Purity
99.74%
Quantity
30 mg → 30.2 mg
Lab
Krause Analytical
Vial
White Label / Red Crimp / Clear Cap
Date
2/20/2026
Purity
99.9%
Quantity
5 mg → 5.42 mg
Lab
Krause Analytical
Vial
White Label / Silver Crimp / White Cap
Date
2/15/2026
Purity
99.7%
Quantity
50 mg → 40.5 mg
Lab
BTLabs
Vial
No Label / Silver Crimp / Red Cap
| Product | Date | Score | Purity | Quantity | Lab | COA |
|---|---|---|---|---|---|---|
| RetatrutideNo label / Silver crimp / Blue cap | 9/7/2026 | — | — | BTLabs | View | |
| TirzepatideNo Label / Silver Crimp / Black Cap | 3/25/2026 | 10.0 | 99.8% | 20 mg → 22 mg | BTLabs | View |
| RetatrutideWhite Label / Red Crimp / Clear Cap | 2/22/2026 | 10.0 | 99.74% | 30 mg → 30.2 mg | Krause Analytical | View |
| TesamorelinWhite Label / Silver Crimp / White Cap | 2/20/2026 | 10.0 | 99.9% | 5 mg → 5.42 mg | Krause Analytical | View |
| GHK-CuNo Label / Silver Crimp / Red Cap | 2/15/2026 | 10.0 | 99.7% | 50 mg → 40.5 mg | BTLabs | View |
Which Zztai Peptide products tested best
Tesamorelin, GHK-Cu, Melanotan II and Retatrutide have the strongest record, graded A or B.
Tirzepatide graded C.
Buying from Zztai Peptide
If you order from Zztai Peptide, start with the graded products in the table: each one links straight to the shop.
We don't track Zztai Peptide's prices yet. Shipping, payment and refund terms are on their site.
The official store is zztai-tech.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 Zztai Peptide
Create a free account to save this vendor, get alerts for new lab tests, and watch price changes.
Zztai Peptide: common questions
Is Zztai Peptide legit?
We rate lab records, not businesses. Mixed lab record: 41 independent tests, 26 of 40 lots filled to label, median purity 99.75%, all 5 products graded C or better. Each result links to its original certificate in the table above.
What do Zztai Peptide reviews say?
We don't hold scored customer reviews for Zztai Peptide yet. The independent lab results on this page are the evidence we have.
Which Zztai Peptide peptides tested best?
We have graded 5 Zztai Peptide products. Tesamorelin, GHK-Cu, Melanotan II and Retatrutide graded A or B.
Is there a Zztai Peptide coupon code?
We don't have a verified Zztai Peptide coupon code. A discount changes the price, not what is in the vial.
Where does Zztai Peptide ship from?
Public listings place Zztai Peptide's shipping origin in Guangdong. Check the shop's own shipping page before ordering, as origin can change.
Ordering from Zztai Peptide?
Mixed lab record: 41 independent tests, 26 of 40 lots filled to label, median purity 99.75%, all 5 products graded C or better.
Contact
- Hong Kong, Shenzhen, Guangdong
- zztai-tech.com