RT Peptide reviews
RT Peptide reviews: 4 independent lab tests across 1 product, with a limited lab record.
Written by the Peptide Vendor Reviews editorial team
Is RT Peptide legit? Lab record: Limited
How we rate- 4 independent tests
- 1 of 3 lots filled to label
- Median purity 99.9%
- Its tested product graded C or better
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Vendor website
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4 independent COAs · not paid-to-rank · 2 of 3 lots under label
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RT Peptide 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 RT Peptide's site.
- RetatrutideCOKAY
- Tests
- 4
- Passed
- 75.0%
What the testing shows
Across 3 measured samples from RT Peptide, 2 came in more than 5% under the quantity on the label (67%). Another 1 measured more than 5% over. Purity across 3 readings ran from 99.9% to 99.99%, median 99.9%. Samples span May 2026 to Oct 2026.
- Under label
- 2/3
- Median purity
- 99.9%
- Latest sample
- Oct 2026
more than 5% short
99.9%–99.99% range
first tested May 2026
Our read on RT Peptide
3 of RT Peptide's 4 graded samples passed (75%), 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 RT Peptide was tested
Samples per month. The darker part of each bar failed.
- Labs used
- Krause Analytical (3), PharmLabs (1)
- Who sent the samples
- buyers 100%
- Batches covered
- 2 distinct batch numbers; 1 checked for endotoxins
Why RT Peptide's failed samples failed
The only failed test, with the lab's reason.
Retatrutide · Sep 15, 2026
the lab could not confirm it was the labelled peptide
Lab testing results
Independent results across 1 product.
Individual lab tests
Date
10/14/2026
Purity
99.99%
Quantity
60 mg → 67.03 mg
Lab
PharmLabs
Vial
Silver crimp / Red cap
Date
9/15/2026
Purity
—
Quantity
—
Lab
Krause Analytical
Vial
No label / Silver crimp / White cap
Date
8/26/2026
Purity
99.9%
Quantity
10 mg → 9.17 mg
Lab
Krause Analytical
Vial
No label / Silver crimp / Black cap
Date
5/5/2026
Purity
99.9%
Quantity
60 mg → 51.1 mg
Lab
Krause Analytical
Vial
No Label / Silver Crimp / Pink Cap
| Product | Date | Score | Purity | Quantity | Lab | COA |
|---|---|---|---|---|---|---|
| RetatrutideSilver crimp / Red cap | 10/14/2026 | 10.0 | 99.99% | 60 mg → 67.03 mg | PharmLabs | View |
| RetatrutideNo label / Silver crimp / White cap | 9/15/2026 | — | — | Krause Analytical | View | |
| RetatrutideNo label / Silver crimp / Black cap | 8/26/2026 | 10.0 | 99.9% | 10 mg → 9.17 mg | Krause Analytical | View |
| RetatrutideNo Label / Silver Crimp / Pink Cap | 5/5/2026 | 10.0 | 99.9% | 60 mg → 51.1 mg | Krause Analytical | View |
Which RT Peptide products tested best
Retatrutide graded C.
Buying from RT Peptide
We don't track RT Peptide's prices yet. Shipping, payment and refund terms are on their site.
The official store is rtpeptide.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 RT Peptide
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RT Peptide: common questions
Is RT Peptide legit?
We rate lab records, not businesses. Limited lab record: 4 independent tests, 1 of 3 lots filled to label, median purity 99.9%, its tested product graded C or better. Each result links to its original certificate in the table above.
What do RT Peptide reviews say?
We don't hold scored customer reviews for RT Peptide yet. The independent lab results on this page are the evidence we have.
Which RT Peptide peptides tested best?
We have graded 1 RT Peptide product.
Is there a RT Peptide coupon code?
We don't have a verified RT Peptide coupon code. A discount changes the price, not what is in the vial.
Ordering from RT Peptide?
Limited lab record: 4 independent tests, 1 of 3 lots filled to label, median purity 99.9%, its tested product graded C or better.