Peptide Factory reviews
Peptide Factory reviews: 4 independent lab tests across 1 product, with a limited lab record.
Written by the Peptide Vendor Reviews editorial team
Is Peptide Factory legit? Lab record: Limited
How we rate- 4 independent tests
- 1 of 3 lots filled to label
- Median purity 99.9%
- 1 of 1 product graded D or E
Some of Peptide Factory's products graded D or E. The shops below tested A or B for the same peptides.
Better-tested Retatrutide
Peptide Factory 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 Peptide Factory 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
Peptide Factory: grade EPeptide Factory 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 Factory's site.
- RetatrutideEBAD
- Tests
- 4
- Passed
- 50.0%
What the testing shows
Across 3 measured samples from Peptide Factory, 2 came in more than 5% under the quantity on the label (67%). Purity across 3 readings ran from 91.4% to 99.9%, median 99.9%. Samples span Jun 2026 to Sep 2026.
- Under label
- 2/3
- Median purity
- 99.9%
- Latest sample
- Sep 2026
- Ships from
- United States
more than 5% short
91.4%–99.9% range
first tested Jun 2026
per vendor listing
Our read on Peptide Factory
2 of Peptide Factory's 4 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 (1 time).
When and how Peptide Factory was tested
Samples per month. The darker part of each bar failed.
- Labs used
- Krause Analytical (2), BTLabs (2)
- Who sent the samples
- buyers 100%
- Batches covered
- 2 distinct batch numbers; 1 checked for endotoxins
Why Peptide Factory's failed samples failed
The 2 most recent failed tests, with the lab's reason.
Retatrutide · Jun 16, 2026
the lab could not confirm it was the labelled peptide
Retatrutide · Jun 12, 2026
purity under 99.5%
Lab testing results
Independent results across 1 product.
Individual lab tests
Date
9/24/2026
Purity
99.9%
Quantity
10 mg → 8.91 mg
Lab
Krause Analytical
Vial
White label / Silver crimp / Black cap
Date
9/16/2026
Purity
99.9%
Quantity
20 mg → 20.1 mg
Lab
BTLabs
Vial
No label / Silver crimp / Pink cap
Date
6/16/2026
Purity
—
Quantity
—
Lab
BTLabs
Vial
No label / Silver crimp / White cap
Date
6/12/2026
Purity
91.4%
Quantity
50 mg → 37.8 mg
Lab
Krause Analytical
Vial
No label / Silver crimp / Blue cap
| Product | Date | Score | Purity | Quantity | Lab | COA |
|---|---|---|---|---|---|---|
| RetatrutideWhite label / Silver crimp / Black cap | 9/24/2026 | 10.0 | 99.9% | 10 mg → 8.91 mg | Krause Analytical | View |
| RetatrutideNo label / Silver crimp / Pink cap | 9/16/2026 | 10.0 | 99.9% | 20 mg → 20.1 mg | BTLabs | View |
| RetatrutideNo label / Silver crimp / White cap | 6/16/2026 | — | — | BTLabs | View | |
| RetatrutideNo label / Silver crimp / Blue cap | 6/12/2026 | 9.1 | 91.4% | 50 mg → 37.8 mg | Krause Analytical | View |
Which Peptide Factory products tested best
Retatrutide graded D or E: a large share of its samples missed purity or quantity thresholds.
Buying from Peptide Factory
We don't track Peptide Factory's prices yet. Shipping, payment and refund terms are on their site.
The official store is peptide-factory.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 Peptide Factory
Create a free account to save this vendor, get alerts for new lab tests, and watch price changes.
Peptide Factory: common questions
Is Peptide Factory legit?
We rate lab records, not businesses. Limited lab record: 4 independent tests, 1 of 3 lots filled to label, median purity 99.9%, 1 of 1 product graded D or E. Each result links to its original certificate in the table above.
What do Peptide Factory reviews say?
We don't hold scored customer reviews for Peptide Factory yet. The independent lab results on this page are the evidence we have.
Which Peptide Factory peptides tested best?
We have graded 1 Peptide Factory product. Retatrutide graded D or E.
Is there a Peptide Factory coupon code?
We don't have a verified Peptide Factory coupon code. A discount changes the price, not what is in the vial.
Where does Peptide Factory ship from?
Public listings place Peptide Factory's shipping origin in United States. Check the shop's own shipping page before ordering, as origin can change.
Ordering from Peptide Factory?
Limited lab record: 4 independent tests, 1 of 3 lots filled to label, median purity 99.9%, 1 of 1 product graded D or E.