NEW SITE — FASTER TURNAROUND, MORE LABS. READ ON
Free peptide testing

Ordered peptides from Group Buy Kits GBK? Mail in a sample (US only) and let us test it.

Test my supply
+5 more ↓
82%
Finnrick rating
#31 of 489 ranked vendors
8 of 9 classifiable tests passed
methodology · Purity focus
methodology →
Peptides
#
Peptide
$/MG
Rating
N
1
GHK-Cu
$0.10
87%
2
2
Retatrutide
$1.13
79%
2
3
Tirzepatide
$0.42
79%
5
8
KPV
-
-
0
9
PT-141
-
-
0
10
Semaglutide
$0.42
-
0
11
TB-500
-
-
0
Contact channels
Rating trend
CUMULATIVE FINNRICK RATING
83%+65%+48%+30%+<30%25 May 2026: 80%15 Jun 2026: 85%15 Jun 2026: 83%16 Jun 2026: 84%28 Aug 2026: 82%28 Aug 2026: 82%17 Sep 2026: 82%14 Oct 2026: 82%20 Oct 2026: 82%23 Oct 2026: current 82%80%82%82%May 26Oct 26
Group Buy Kits GBK test history
COA-backed lab tests
DateResultTestLabPurityDosageLabelCOA
20 Oct 2026
Pass
Tirzepatide
lab nameView COA
14 Oct 2026
Pass
Retatrutide
lab nameView COA
17 Sep 2026
Pass
Tirzepatide
lab nameView COA
28 Aug 2026
Pass
Retatrutide
lab nameView COA
28 Aug 2026
Pass
GHK-Cu
lab nameView COA
16 Jun 2026
Pass
Tirzepatide
lab nameView COA
15 Jun 2026
Fail
Tirzepatide
lab nameView COA
15 Jun 2026
Pass
GHK-Cu
lab nameView COA
25 May 2026
Pass
Tirzepatide
lab nameView COA

About Group Buy Kits GBK test results from Finnrick

Group Buy Kits GBK is a peptide vendor tracked in Finnrick's independent testing dataset. This page compiles batch-level results across 3 peptides and 9 tests, including ratings, observed price signals, recent test dates, and correction history where available.

Finnrick ratings are calculated from published sample data using the selected rating standard. The default standard evaluates purity, dose accuracy, and label quality, then adjusts low-volume results so small sample counts do not appear more certain than the data supports.

The most visible Group Buy Kits GBK peptides in this dataset are GHK-Cu (2 tests), Retatrutide (2 tests) and Tirzepatide (5 tests). Use the peptide table above to compare the current Finnrick rating, price per mg, and sample volume for each peptide.

Recent tests and corrections are shown below when available. Samples may be acquired by Finnrick directly or submitted through Finnrick testing programs; the goal is to make safety and supply-chain evidence easier to evaluate than vendor marketing claims alone. This page currently lists 9 recent tests.

Corrections
No corrections.
Free peptide testing

Ordered peptides from Group Buy Kits GBK? Mail in a sample (US only) and let us test it.

Test my supply