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Group Buy Kits GBKRetatrutide

6 testslatest 6 Nov 2026$1.13/mg median
Peptide testing

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

Test my supply
+5 more ↓
78%
Finnrick rating
#200 of 417 Retatrutide vendors
4 of 5 classifiable tests passed
customers 4.0★ (13)
methodology · Purity focus
Finnrick analysis · Retatrutide

Group Buy Kits GBK retatrutide is pulled down by a recent purity miss after earlier clean results. Key details are the Nov. 2 99.1% / -16% result and a later nonclassifiable 20 mg report showing 0 mg with no purity/identity call.

methodology →
Peptides
#
Peptide
$/MG
Rating
N
1
GHK-Cu
$0.10
88%
4
2
Tirzepatide
$0.42
79%
5
3
Retatrutideselected
$1.13
78%
6
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%28 Aug 2026: 79%13 Oct 2026: 79%14 Oct 2026: 81%30 Oct 2026: 81%2 Nov 2026: 78%12 Nov 2026: current 78%79%79%78%Aug 26Nov 26
Showing Retatrutide tests only
Group Buy Kits GBK Retatrutide test history
COA-backed lab tests

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 15 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 (4 tests), Retatrutide (6 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 15 recent tests.

Corrections
No corrections.
Peptide testing

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

Test my supply