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Group Buy Kits GBKTirzepatide

5 testslatest 20 Oct 2026$0.42/mg median
Peptide testing

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

Test my supply
+5 more ↓
79%
Finnrick rating
#133 of 281 Tirzepatide vendors
4 of 5 classifiable tests passed
customers 4.1★ (9)
methodology · Purity focus
Finnrick analysis · Tirzepatide

Group Buy Kits GBK's purity-focus record is strongest on GHK-Cu, where recent purity and fill results cluster tightly, while Retatrutide and Tirzepatide are more mixed. The evidence is current and moderately broad, but Retatrutide has a recent purity miss plus a zero-fill nonclassifiable report, and recent GHK-Cu entries omit identity calls.

methodology →
Peptides
#
Peptide
$/MG
Rating
N
1
GHK-Cu
$0.10
88%
4
2
Tirzepatideselected
$0.42
79%
5
3
Retatrutide
$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%25 May 2026: 80%15 Jun 2026: 76%16 Jun 2026: 77%17 Sep 2026: 78%20 Oct 2026: 79%12 Nov 2026: current 79%80%79%May 26Nov 26
Showing Tirzepatide tests only
Group Buy Kits GBK Tirzepatide 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 Tirzepatide from Group Buy Kits GBK? Mail in a sample (US only) and let us test it.

Test my supply