Changyuan Polypeptide reviews
Changyuan Polypeptide reviews: 8 independent lab tests across 2 products, with a limited lab record.
Written by the Peptide Vendor Reviews editorial team
Is Changyuan Polypeptide legit? Lab record: Limited
How we rate- 8 independent tests
- 3 of 4 lots filled to label
- Median purity 99.7%
- 2 of 2 products graded D or E
Some of Changyuan Polypeptide's products graded D or E. The shops below tested A or B for the same peptides.
Better-tested Retatrutide
Changyuan Polypeptide graded E. Paradigm Peptide's Retatrutide graded A across 8 tests, $10.00 / 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 Changyuan Polypeptide 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.
Retatrutide
Changyuan Polypeptide: grade ETirzepatide
Changyuan Polypeptide: grade EChangyuan Polypeptide 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 Changyuan Polypeptide's site.
- RetatrutideEBAD
- Tests
- 5
- Passed
- 50.0%
- TirzepatideEBAD
- Tests
- 3
- Passed
- 50.0%
What the testing shows
Across 4 measured samples from Changyuan Polypeptide, 1 came in more than 5% under the quantity on the label (25%). Another 1 measured more than 5% over. Purity across 4 readings ran from 99.6% to 99.9%, median 99.7%. Samples span Apr 2026 to Aug 2026.
- Under label
- 1/4
- Median purity
- 99.7%
- Latest sample
- Aug 2026
more than 5% short
99.6%–99.9% range
first tested Apr 2026
Our read on Changyuan Polypeptide
3 of Changyuan Polypeptide's 6 graded samples passed (50%), 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, Changyuan Polypeptide's pass rate is at or above 16% of them, and it has more tests on record than 22% of them.
When and how Changyuan Polypeptide was tested
Samples per month. The darker part of each bar failed.
- Labs used
- BTLabs (7), Krause Analytical (1)
- Who sent the samples
- buyers 100%
- Batches covered
- 3 distinct batch numbers; 3 checked for endotoxins
Why Changyuan Polypeptide's failed samples failed
The 3 most recent failed tests, with the lab's reason.
Retatrutide · Aug 9, 2026
the lab could not confirm it was the labelled peptide
Tirzepatide · Jun 26, 2026
the lab could not confirm it was the labelled peptide
Retatrutide · May 8, 2026
amount in the vial more than 35% off the label
Lab testing results
Independent results across 2 products.
Individual lab tests
Date
8/9/2026
Purity
—
Quantity
—
Lab
BTLabs
Vial
No label, Copper crimp, Clear cap
Date
8/4/2026
Purity
99.9%
Quantity
20 mg → 21.8 mg
Lab
Krause Analytical
Vial
No label / Silver crimp / Clear Purple cap
Date
6/26/2026
Purity
—
Quantity
—
Lab
BTLabs
Vial
White label / Silver crimp / Clear cap
Date
6/26/2026
Purity
—
Quantity
—
Lab
BTLabs
Vial
White label / Silver crimp / Clear cap
Date
5/11/2026
Purity
—
Quantity
—
Lab
BTLabs
Vial
No Label / Gold Crimp / Clear Cap
| Product | Date | Score | Purity | Quantity | Lab | COA |
|---|---|---|---|---|---|---|
| RetatrutideNo label, Copper crimp, Clear cap | 8/9/2026 | — | — | BTLabs | View | |
| RetatrutideNo label / Silver crimp / Clear Purple cap | 8/4/2026 | 10.0 | 99.9% | 20 mg → 21.8 mg | Krause Analytical | View |
| TirzepatideWhite label / Silver crimp / Clear cap | 6/26/2026 | — | — | BTLabs | View | |
| TirzepatideWhite label / Silver crimp / Clear cap | 6/26/2026 | — | — | BTLabs | View | |
| RetatrutideNo Label / Gold Crimp / Clear Cap | 5/11/2026 | — | — | BTLabs | View |
Which Changyuan Polypeptide products tested best
Retatrutide and Tirzepatide graded D or E: a large share of their samples missed purity or quantity thresholds.
Buying from Changyuan Polypeptide
We don't track Changyuan Polypeptide's prices yet. Shipping, payment and refund terms are on their site.
The official store is www.changyuanpolypeptide.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 Changyuan Polypeptide
Create a free account to save this vendor, get alerts for new lab tests, and watch price changes.
Changyuan Polypeptide: common questions
Is Changyuan Polypeptide legit?
We rate lab records, not businesses. Limited lab record: 8 independent tests, 3 of 4 lots filled to label, median purity 99.7%, 2 of 2 products graded D or E. Each result links to its original certificate in the table above.
What do Changyuan Polypeptide reviews say?
We don't hold scored customer reviews for Changyuan Polypeptide yet. The independent lab results on this page are the evidence we have.
Which Changyuan Polypeptide peptides tested best?
We have graded 2 Changyuan Polypeptide products. Retatrutide and Tirzepatide graded D or E.
Is there a Changyuan Polypeptide coupon code?
We don't have a verified Changyuan Polypeptide coupon code. A discount changes the price, not what is in the vial.
Ordering from Changyuan Polypeptide?
Limited lab record: 8 independent tests, 3 of 4 lots filled to label, median purity 99.7%, 2 of 2 products graded D or E.