Is Purepeptides Legit
Is Purepeptides Legit? 25 independent lab tests across 4 products, with a mixed lab record.
Written by the Peptide Vendor Reviews editorial team
Lab record: Mixed
How we rate- 25 independent tests
- 15 of 21 lots filled to label
- Median purity 99.9%
- 1 of 3 products graded D or E
Some of PurePeptides's products graded D or E. The shops below tested A or B for the same peptides.
Better-tested Tesamorelin
PurePeptides 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 PurePeptides 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
PurePeptides: grade EPurePeptides 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 PurePeptides' site.
- TirzepatideAGREAT
- Tests
- 6
- Passed
- 100.0%
- RetatrutideCOKAY
- Tests
- 10
- Passed
- 70.0%
- TesamorelinEBAD
- Tests
- 5
- Passed
- 40.0%
- Tests
- 4
- Passed
- —
What the testing shows
Across 21 measured samples from PurePeptides, 6 came in more than 5% under the quantity on the label (29%). Another 12 measured more than 5% over. Purity across 21 readings ran from 71.09% to 99.99%, median 99.9%. Samples span Feb 2025 to Oct 2026.
- Under label
- 6/21
- Median purity
- 99.9%
- Latest sample
- Oct 2026
more than 5% short
71.09%–99.99% range
first tested Feb 2025
Our read on PurePeptides
15 of PurePeptides' 25 graded samples passed (60%), and 52% of all samples were sent in by buyers rather than by the shop.
Results are slipping: 29% passed over the latest six months, down from 72% before.
When a sample failed, the most common reason was amount in the vial more than 35% off the label (5 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, PurePeptides' pass rate is at or above 25% of them, and it has more tests on record than 59% of them.
When and how PurePeptides was tested
Samples per month. The darker part of each bar failed.
- Labs used
- Krause Analytical (10), TrustPointe (6), MZ Biolabs (3), Chromate (3)
- Who sent the samples
- buyers 52%, testing programme 48%
- Batches covered
- 11 distinct batch numbers; 2 checked for endotoxins
Why PurePeptides' failed samples failed
The 6 most recent failed tests, with the lab's reason.
Retatrutide · Sep 23, 2026
the lab could not confirm it was the labelled peptide
Tesamorelin · Sep 21, 2026
the lab could not confirm it was the labelled peptide
Tesamorelin · Aug 12, 2026
amount in the vial more than 35% off the label
Retatrutide · Jul 13, 2026
the lab could not confirm it was the labelled peptide
Tesamorelin · Jul 13, 2026
the lab could not confirm it was the labelled peptide
Retatrutide · Mar 19, 2026
amount in the vial more than 35% off the label
Lab testing results
Independent results across 4 products.
Individual lab tests
Date
10/12/2026
Purity
99.99%
Quantity
30 mg → 29.71 mg
Lab
PharmLabs
Vial
Silver crimp / Black cap
Date
10/12/2026
Purity
99.99%
Quantity
20 mg → 21.24 mg
Lab
PharmLabs
Vial
Silver crimp / Black cap
Date
9/23/2026
Purity
—
Quantity
—
Lab
Krause Analytical
Vial
White label / Silver crimp / Red cap
Date
9/21/2026
Purity
—
Quantity
—
Lab
Ichor Life Sciences
Vial
Black label / Silver crimp / Orange cap
Date
8/12/2026
Purity
99.9%
Quantity
10 mg → 5.45 mg
Lab
Krause Analytical
Vial
Silver label / Silver crimp / White cap
| Product | Date | Score | Purity | Quantity | Lab | COA |
|---|---|---|---|---|---|---|
| RetatrutideSilver crimp / Black cap | 10/12/2026 | 10.0 | 99.99% | 30 mg → 29.71 mg | PharmLabs | View |
| RetatrutideSilver crimp / Black cap | 10/12/2026 | 10.0 | 99.99% | 20 mg → 21.24 mg | PharmLabs | View |
| RetatrutideWhite label / Silver crimp / Red cap | 9/23/2026 | — | — | Krause Analytical | View | |
| TesamorelinBlack label / Silver crimp / Orange cap | 9/21/2026 | — | — | Ichor Life Sciences | View | |
| TesamorelinSilver label / Silver crimp / White cap | 8/12/2026 | 10.0 | 99.9% | 10 mg → 5.45 mg | Krause Analytical | View |
Which PurePeptides products tested best
Tirzepatide has the strongest record, graded A or B.
Retatrutide graded C.
Tesamorelin graded D or E: a large share of its samples missed purity or quantity thresholds.
Buying from PurePeptides
If you order from PurePeptides, 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 PurePeptides' prices yet. Shipping, payment and refund terms are on their site.
The official store is purepeptides.bio. 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 PurePeptides
Create a free account to save this vendor, get alerts for new lab tests, and watch price changes.
PurePeptides: common questions
Is PurePeptides legit?
We rate lab records, not businesses. Mixed lab record: 25 independent tests, 15 of 21 lots filled to label, median purity 99.9%, 1 of 3 products graded D or E. Each result links to its original certificate in the table above.
What do PurePeptides reviews say?
We don't hold scored customer reviews for PurePeptides yet. The independent lab results on this page are the evidence we have.
Which PurePeptides peptides tested best?
We have graded 3 PurePeptides products. Tirzepatide graded A or B. Tesamorelin graded D or E.
Is there a PurePeptides coupon code?
We don't have a verified PurePeptides coupon code. A discount changes the price, not what is in the vial.
Ordering from PurePeptides?
Mixed lab record: 25 independent tests, 15 of 21 lots filled to label, median purity 99.9%, 1 of 3 products graded D or E.