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Peptide testing

Ordered peptides from M-Peptides? Mail in a sample (US only) and let us test it.

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76%
Finnrick rating
#201 of 498 ranked vendors
19 of 26 classifiable tests passed
methodology · Purity focus
Finnrick analysis

M-Peptides' Purity focus record is strongest in Tirzepatide, where recent testing is clean after earlier purity misses and the evidence base is fairly developed. Retatrutide is more dispersed, with repeated purity failures and documented fill swings from -39% to +27%, so the catalog signal is uneven despite recent improvement.

methodology →
vendor intelligence report
Vendor Intelligence Report: M-Peptides

The full report traces a bracelet-themed WooCommerce order portal, two near-lookalike domains, and a stale contact trail that creates impersonation risk. It also maps Elsa’s public footprint, warehouse/regulatory exposure, and Janoshik-only recourse.

26 pages7 risk factors assessed13 Jun 2026
read the report
Peptides
#
Peptide
$/MG
Rating
N
1
Tirzepatide
$0.33
83%
15
2
Retatrutide
$0.62
68%
11
3
NAD+
-
-
0
Contact channels
Rating trend
CUMULATIVE FINNRICK RATING
83%+65%+48%+30%+<30%20 Jun 2025: 69%20 Jun 2025: 71%2 Jul 2025: 65%25 Jul 2025: 70%4 Sep 2025: 75%21 Oct 2025: 76%21 Oct 2025: 78%23 Oct 2025: 75%23 Oct 2025: 73%29 Oct 2025: 74%25 Nov 2025: 72%29 Dec 2025: 73%7 Jan 2026: 72%7 Jan 2026: 73%11 Feb 2026: 74%18 Feb 2026: 72%4 Mar 2026: 73%18 Mar 2026: 73%27 May 2026: 74%12 Jun 2026: 75%22 Jun 2026: 74%22 Jun 2026: 74%14 Sep 2026: 75%30 Sep 2026: 75%2 Nov 2026: 76%2 Nov 2026: 76%14 Nov 2026: current 76%69%73%76%Jun 25Nov 26
Peptide testing

Ordered peptides from M-Peptides? Mail in a sample (US only) and let us test it.

Test my supply
M-Peptides test history
COA-backed lab tests
DateResultTestLabPurityDosageLabelCOA
2 Nov 2026
Pass
Tirzepatide
lab nameView COA
2 Nov 2026
Pass
Retatrutide
lab nameView COA
30 Sep 2026
Pass
Retatrutide
lab nameView COA
14 Sep 2026
Pass
Tirzepatide
lab nameView COA
22 Jun 2026
Pass
Tirzepatide
lab nameView COA
22 Jun 2026
Fail
Retatrutide
lab nameView COA
12 Jun 2026
Pass
Tirzepatide
lab nameView COA
27 May 2026
Pass
Tirzepatide
lab nameView COA
18 Mar 2026
Pass
Retatrutide
lab nameView COA
4 Mar 2026
Pass
Tirzepatide
lab nameView COA
1-10 of 26

About M-Peptides test results from Finnrick

M-Peptides is a peptide vendor tracked in Finnrick's independent testing dataset. This page compiles batch-level results across 2 peptides and 26 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 M-Peptides peptides in this dataset are Retatrutide (11 tests), Tirzepatide (15 tests) and NAD+ (0 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 26 recent tests. It also includes 1 correction related to this vendor.

Corrections
2025-11-17
Finnrick data entry
Test results published from 31 Oct to 17 Nov 2025 under Peptide Sciences, but the sample was misidentified, and re-attributed to the correct vendor.
Peptide testing

Ordered peptides from M-Peptides? Mail in a sample (US only) and let us test it.

Test my supply