Peptide-S reviews
Peptide-S reviews: 134 independent lab tests across 11 products, with a mixed lab record, and 3 verified customer reviews.
Written by the Peptide Vendor Reviews editorial team
Is Peptide-S legit? Lab record: Mixed
How we rate- 134 independent tests
- 90 of 126 lots filled to label
- Median purity 99.78%
- 4 of 10 products graded D or E
Some of Peptide-S's products graded D or E. The shops below tested A or B for the same peptides.
Better-tested Tesamorelin
Peptide-S 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 Peptide-S 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
Peptide-S: grade ECagrilintide
Peptide-S: grade ERetatrutide
Peptide-S: grade DPeptide-S 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 Peptide-S' site.
- GHK-CuAGREAT
- Tests
- 9
- Passed
- 100.0%
- SurvodutideAGREAT
- Tests
- 4
- Passed
- 100.0%
- TirzepatideBGOOD
- Tests
- 41
- Passed
- 85.0%
- SemaglutideBGOOD
- Tests
- 6
- Passed
- 80.0%
- MazdutideCOKAY
- Tests
- 4
- Passed
- 75.0%
- IpamorelinCOKAY
- Tests
- 4
- Passed
- 75.0%
- RetatrutideDPOOR
- Tests
- 45
- Passed
- 65.9%
- BPC-157DPOOR
- Tests
- 5
- Passed
- 60.0%
- TesamorelinEBAD
- Tests
- 9
- Passed
- 33.3%
- CagrilintideEBAD
- Tests
- 4
- Passed
- 25.0%
- Sermorelin—
- Tests
- 3
- Passed
- —
What the testing shows
Across 126 measured samples from Peptide-S, 36 came in more than 5% under the quantity on the label (29%). Another 45 measured more than 5% over. Purity across 126 readings ran from 76.42% to 99.97%, median 99.78%. Samples span Jun 2025 to Oct 2026.
- Under label
- 36/126
- Median purity
- 99.78%
- Latest sample
- Oct 2026
- Ships from
- United States
more than 5% short
76.42%–99.97% range
first tested Jun 2025
per vendor listing
Our read on Peptide-S
92 of Peptide-S' 130 graded samples passed (71%), and 82% of all samples were sent in by buyers rather than by the shop.
Results are improving: 83% passed over the latest six months, up from 70% before.
When a sample failed, the most common reason was purity under 99.5% (29 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, Peptide-S' pass rate is at or above 47% of them, and it has more tests on record than 95% of them.
On Trustpilot, 3 customer reviews average 3.7 out of 5; the topic customers raise most is payment and refunds, mentioned in 3 reviews, 67% of them positive.
When and how Peptide-S was tested
Samples per month. The darker part of each bar failed.
- Labs used
- Krause Analytical (84), Freedom Diagnostics (19), BTLabs (15), Chromate (13)
- Who sent the samples
- buyers 82%, testing programme 18%
- Batches covered
- 37 distinct batch numbers; 7 checked for endotoxins
Why Peptide-S' failed samples failed
The 6 most recent failed tests, with the lab's reason.
Retatrutide · Aug 9, 2026
the lab could not confirm it was the labelled peptide
Retatrutide · Feb 22, 2026
purity under 99.5%
Sermorelin · Feb 20, 2026
purity under 99.5%
Tesamorelin · Jan 15, 2026
purity under 99.5%
Cagrilintide · Nov 25, 2025
purity under 99.5%
Mazdutide · Nov 25, 2025
purity under 99.5%
What Peptide-S' customers report
From 3 reviews on Trustpilot, the latest from Jul 9, 2025.
- Payment and refunds3 mentions
67% of these were 4 or 5 stars
- Shipping and delivery2 mentions
50% of these were 4 or 5 stars
Typical praise · 5★
“I have ordered 3 times from this company the last time I did receive a notification from DHL - after 3 weeks from placing my order and following tracking, that I needed…”
Typical complaint · 1★
“*UPDATE-I received a letter from the FDA that my order had been seized. I contacted the seller who was no help.”
Most recent · 5★
“Ordered my peptides and within 14 days i received my order.seller offers paypal which added to their credibility as a business .Products are good quality communication…”
Lab testing results
Independent results across 11 products.
Individual lab tests
Date
10/8/2026
Purity
99.9%
Quantity
10 mg → 11.3 mg
Lab
Krause Analytical
Vial
No label / Silver crimp / Black cap
Date
8/9/2026
Purity
—
Quantity
—
Lab
BTLabs
Vial
No label, Silver crimp, White cap
Date
8/9/2026
Purity
99.8%
Quantity
60 mg → 55.6 mg
Lab
BTLabs
Vial
No label, Silver crimp, Black cap
Date
8/3/2026
Purity
99.9%
Quantity
10 mg → 10.6 mg
Lab
Krause Analytical
Vial
No label / Silver crimp / Black cap
| Product | Date | Score | Purity | Quantity | Lab | COA |
|---|---|---|---|---|---|---|
| TesamorelinNo label / Silver crimp / Black cap | 10/8/2026 | 10.0 | 99.9% | 10 mg → 11.3 mg | Krause Analytical | View |
| RetatrutideNo label, Silver crimp, White cap | 8/9/2026 | — | — | BTLabs | View | |
| Retatrutide | 8/9/2026 | 10.0 | 99.6% | 5 mg → 5.6 mg | BTLabs | View |
| TirzepatideNo label, Silver crimp, Black cap | 8/9/2026 | 10.0 | 99.8% | 60 mg → 55.6 mg | BTLabs | View |
| TesamorelinNo label / Silver crimp / Black cap | 8/3/2026 | 10.0 | 99.9% | 10 mg → 10.6 mg | Krause Analytical | View |
Which Peptide-S products tested best
GHK-Cu, Survodutide, Tirzepatide and Semaglutide have the strongest record, graded A or B.
Mazdutide and Ipamorelin graded C.
Retatrutide, BPC-157, Tesamorelin and Cagrilintide graded D or E: a large share of their samples missed purity or quantity thresholds.
Buying from Peptide-S
If you order from Peptide-S, 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 Peptide-S' prices yet. Shipping, payment and refund terms are on their site.
The official store is www.peptide-s.shop. 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 Peptide-S
Create a free account to save this vendor, get alerts for new lab tests, and watch price changes.
Peptide-S: common questions
Is Peptide-S legit?
We rate lab records, not businesses. Mixed lab record: 134 independent tests, 90 of 126 lots filled to label, median purity 99.78%, 4 of 10 products graded D or E. Each result links to its original certificate in the table above.
What do Peptide-S reviews say?
We hold 3 customer reviews for Peptide-S, averaging 3.7 out of 5. Reviews describe service and delivery; the lab results describe what was in the vial.
Which Peptide-S peptides tested best?
We have graded 10 Peptide-S products. GHK-Cu, Survodutide, Tirzepatide and Semaglutide graded A or B. Retatrutide, BPC-157, Tesamorelin and Cagrilintide graded D or E.
Is there a Peptide-S coupon code?
We don't have a verified Peptide-S coupon code. A discount changes the price, not what is in the vial.
Where does Peptide-S ship from?
Public listings place Peptide-S's shipping origin in United States. Check the shop's own shipping page before ordering, as origin can change.
Ordering from Peptide-S?
Mixed lab record: 134 independent tests, 90 of 126 lots filled to label, median purity 99.78%, 4 of 10 products graded D or E.
About Peptide-S
Peptide-S is a peptide vendor.
Contact
- United States
- www.peptide-s.shop