Group Buy Kits GBK reviews
Group Buy Kits GBK reviews: 8 independent lab tests across 3 products, with a limited lab record.
Written by the Peptide Vendor Reviews editorial team
Is Group Buy Kits GBK legit? Lab record: Limited
How we rate- 8 independent tests
- 7 of 7 lots filled to label
- Median purity 99.8%
- All 3 products graded C or better
Opens the vendor's site. We don't earn from this link, and no one pays to rank.
Vendor website
Visit Group Buy Kits GBK
8 independent COAs · not paid-to-rank · 0 of 7 lots under label
Visit Group Buy Kits GBKOpens the vendor site. No partner discount on this shop.
Peptide Vendor Reviews independently tests products and verifies reviews. Public methodology, no pay-to-rank.
Group Buy Kits GBK 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 Group Buy Kits GBK's site.
- RetatrutideAGREAT
- Tests
- 2
- Passed
- 100.0%
- GHK-CuAGREAT
- Tests
- 2
- Passed
- 100.0%
- TirzepatideCOKAY
- Tests
- 4
- Passed
- 75.0%
What the testing shows
Across 7 measured samples from Group Buy Kits GBK, 0 came in more than 5% under the quantity on the label (0%). Another 4 measured more than 5% over. Purity across 7 readings ran from 99.7% to 99.99%, median 99.8%. Samples span May 2026 to Oct 2026.
- Under label
- 0/7
- Median purity
- 99.8%
- Latest sample
- Oct 2026
more than 5% short
99.7%–99.99% range
first tested May 2026
Our read on Group Buy Kits GBK
7 of Group Buy Kits GBK's 8 graded samples passed (88%), 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).
Against the 302 shops with at least five graded tests, Group Buy Kits GBK's pass rate is at or above 85% of them, and it has more tests on record than 22% of them.
When and how Group Buy Kits GBK was tested
Samples per month. The darker part of each bar failed.
- Labs used
- BTLabs (4), Krause Analytical (3), PharmLabs (1)
- Who sent the samples
- buyers 100%
- Batches covered
- 8 distinct batch numbers; 1 checked for endotoxins
Why Group Buy Kits GBK's failed samples failed
The only failed test, with the lab's reason.
Tirzepatide · Jun 15, 2026
the lab could not confirm it was the labelled peptide
Lab testing results
Independent results across 3 products.
Individual lab tests
Date
10/14/2026
Purity
99.99%
Quantity
10 mg → 9.5 mg
Lab
PharmLabs
Vial
Silver crimp / Black cap
Date
9/17/2026
Purity
99.9%
Quantity
30 mg → 32.7 mg
Lab
Krause Analytical
Vial
No label / Silver crimp / Black cap
Date
8/28/2026
Purity
99.7%
Quantity
50 mg → 54.5 mg
Lab
BTLabs
Vial
Silver label / Silver crimp / Clear cap
Date
8/28/2026
Purity
99.8%
Quantity
10 mg → 10.9 mg
Lab
BTLabs
Vial
Silver label / Silver crimp / Yellow cap
Date
6/16/2026
Purity
99.8%
Quantity
10 mg → 10.2 mg
Lab
BTLabs
Vial
White label / Silver crimp / Orange cap
| Product | Date | Score | Purity | Quantity | Lab | COA |
|---|---|---|---|---|---|---|
| RetatrutideSilver crimp / Black cap | 10/14/2026 | 10.0 | 99.99% | 10 mg → 9.5 mg | PharmLabs | View |
| TirzepatideNo label / Silver crimp / Black cap | 9/17/2026 | 10.0 | 99.9% | 30 mg → 32.7 mg | Krause Analytical | View |
| GHK-CuSilver label / Silver crimp / Clear cap | 8/28/2026 | 10.0 | 99.7% | 50 mg → 54.5 mg | BTLabs | View |
| RetatrutideSilver label / Silver crimp / Yellow cap | 8/28/2026 | 10.0 | 99.8% | 10 mg → 10.9 mg | BTLabs | View |
| TirzepatideWhite label / Silver crimp / Orange cap | 6/16/2026 | 10.0 | 99.8% | 10 mg → 10.2 mg | BTLabs | View |
Which Group Buy Kits GBK products tested best
Retatrutide and GHK-Cu have the strongest record, graded A or B.
Tirzepatide graded C.
Buying from Group Buy Kits GBK
If you order from Group Buy Kits GBK, start with the graded products in the table: each one links straight to the shop.
We don't track Group Buy Kits GBK's prices yet. Shipping, payment and refund terms are on their site.
The official store is groupbuykits.com/register. 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 Group Buy Kits GBK
Create a free account to save this vendor, get alerts for new lab tests, and watch price changes.
Group Buy Kits GBK: common questions
Is Group Buy Kits GBK legit?
We rate lab records, not businesses. Limited lab record: 8 independent tests, 7 of 7 lots filled to label, median purity 99.8%, all 3 products graded C or better. Each result links to its original certificate in the table above.
What do Group Buy Kits GBK reviews say?
We don't hold scored customer reviews for Group Buy Kits GBK yet. The independent lab results on this page are the evidence we have.
Which Group Buy Kits GBK peptides tested best?
We have graded 3 Group Buy Kits GBK products. Retatrutide and GHK-Cu graded A or B.
Is there a Group Buy Kits GBK coupon code?
We don't have a verified Group Buy Kits GBK coupon code. A discount changes the price, not what is in the vial.
Ordering from Group Buy Kits GBK?
Limited lab record: 8 independent tests, 7 of 7 lots filled to label, median purity 99.8%, all 3 products graded C or better.