Crestpeptide reviews
Crestpeptide reviews: 19 independent lab tests across 5 products, with a mixed lab record.
Written by the Peptide Vendor Reviews editorial team
Is Crestpeptide legit? Lab record: Mixed
How we rate- 19 independent tests
- 9 of 17 lots filled to label
- Median purity 99.8%
- 2 of 5 products graded D or E
Some of Crestpeptide's products graded D or E. The shops below tested A or B for the same peptides.
Better-tested Tesamorelin
Crestpeptide 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 Crestpeptide 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
Crestpeptide: grade EBPC-157
Crestpeptide: grade ECrestpeptide 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 Crestpeptide's site.
- GHK-CuAGREAT
- Tests
- 3
- Passed
- 100.0%
- RetatrutideBGOOD
- Tests
- 5
- Passed
- 80.0%
- TirzepatideCOKAY
- Tests
- 4
- Passed
- 75.0%
- TesamorelinEBAD
- Tests
- 4
- Passed
- 50.0%
- BPC-157EBAD
- Tests
- 3
- Passed
- 33.3%
What the testing shows
Across 17 measured samples from Crestpeptide, 8 came in more than 5% under the quantity on the label (47%). Another 5 measured more than 5% over. Purity across 17 readings ran from 98.1% to 99.95%, median 99.8%. Samples span Oct 2025 to Sep 2026.
- Under label
- 8/17
- Median purity
- 99.8%
- Latest sample
- Sep 2026
- Ships from
- China
more than 5% short
98.1%–99.95% range
first tested Oct 2025
per vendor listing
Our read on Crestpeptide
13 of Crestpeptide's 19 graded samples passed (68%), and 100% of all samples were sent in by buyers rather than by the shop.
Results are slipping: 50% passed over the latest six months, down from 82% before.
When a sample failed, the most common reason was purity under 99.5% (3 times).
2 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, Crestpeptide's pass rate is at or above 42% of them, and it has more tests on record than 49% of them.
When and how Crestpeptide was tested
Samples per month. The darker part of each bar failed.
- Labs used
- Krause Analytical (12), BTLabs (5), Ichor Life Sciences (2)
- Who sent the samples
- buyers 100%
- Batches covered
- 11 distinct batch numbers; 4 checked for endotoxins
Why Crestpeptide's failed samples failed
The 6 most recent failed tests, with the lab's reason.
Tesamorelin · Sep 21, 2026
the lab could not confirm it was the labelled peptide
Retatrutide · Sep 16, 2026
the lab could not confirm it was the labelled peptide
Tirzepatide · Sep 4, 2026
purity under 99.5%
BPC-157 · May 28, 2026
purity under 99.5%
Tesamorelin · Feb 19, 2026
purity under 99.5%
BPC-157 · Feb 10, 2026
amount in the vial more than 35% off the label
Lab testing results
Independent results across 5 products.
Individual lab tests
Date
9/21/2026
Purity
—
Quantity
—
Lab
Ichor Life Sciences
Vial
White label / Silver crimp / Red cap
Date
9/16/2026
Purity
—
Quantity
—
Lab
Ichor Life Sciences
Vial
White label / Silver crimp / White cap
Date
9/4/2026
Purity
98.1%
Quantity
10 mg → 9.36 mg
Lab
Krause Analytical
Vial
No label / Silver crimp / Violet cap
Date
8/20/2026
Purity
99.6%
Quantity
100 mg → 111.2 mg
Lab
BTLabs
Vial
No label / Silver crimp / Orange cap
Date
8/9/2026
Purity
99.6%
Quantity
10 mg → 9.1 mg
Lab
BTLabs
Vial
No label / Silver crimp / Clear Blue cap
| Product | Date | Score | Purity | Quantity | Lab | COA |
|---|---|---|---|---|---|---|
| TesamorelinWhite label / Silver crimp / Red cap | 9/21/2026 | — | — | Ichor Life Sciences | View | |
| RetatrutideWhite label / Silver crimp / White cap | 9/16/2026 | — | — | Ichor Life Sciences | View | |
| TirzepatideNo label / Silver crimp / Violet cap | 9/4/2026 | 9.8 | 98.1% | 10 mg → 9.36 mg | Krause Analytical | View |
| GHK-CuNo label / Silver crimp / Orange cap | 8/20/2026 | 10.0 | 99.6% | 100 mg → 111.2 mg | BTLabs | View |
| BPC-157No label / Silver crimp / Clear Blue cap | 8/9/2026 | 10.0 | 99.6% | 10 mg → 9.1 mg | BTLabs | View |
Which Crestpeptide products tested best
GHK-Cu and Retatrutide have the strongest record, graded A or B.
Tirzepatide graded C.
Tesamorelin and BPC-157 graded D or E: a large share of their samples missed purity or quantity thresholds.
Buying from Crestpeptide
If you order from Crestpeptide, 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 Crestpeptide's prices yet. Shipping, payment and refund terms are on their site.
The official store is crestpeptide.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 Crestpeptide
Create a free account to save this vendor, get alerts for new lab tests, and watch price changes.
Crestpeptide: common questions
Is Crestpeptide legit?
We rate lab records, not businesses. Mixed lab record: 19 independent tests, 9 of 17 lots filled to label, median purity 99.8%, 2 of 5 products graded D or E. Each result links to its original certificate in the table above.
What do Crestpeptide reviews say?
We don't hold scored customer reviews for Crestpeptide yet. The independent lab results on this page are the evidence we have.
Which Crestpeptide peptides tested best?
We have graded 5 Crestpeptide products. GHK-Cu and Retatrutide graded A or B. Tesamorelin and BPC-157 graded D or E.
Is there a Crestpeptide coupon code?
We don't have a verified Crestpeptide coupon code. A discount changes the price, not what is in the vial.
Where does Crestpeptide ship from?
Public listings place Crestpeptide's shipping origin in China. Check the shop's own shipping page before ordering, as origin can change.
Ordering from Crestpeptide?
Mixed lab record: 19 independent tests, 9 of 17 lots filled to label, median purity 99.8%, 2 of 5 products graded D or E.
Contact
- china
- crestpeptide.com