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PepIndex

Testing laboratory

MZ Biolabs

MZ Biolabs, Tucson, Arizona, signed 30 of the certificates behind these rankings, covering 1 vendor and 23 compounds, at a mean reported purity of 99.64%. Its own site makes no ISO/IEC 17025 claim. We have found no public lookup for this laboratory, so its reports can be read but not independently re-pulled.

30 certificates · 1 vendors · 23 compounds · assays 6 Jul 2024 to 10 Apr 2026

Accreditation and verification

Location
Tucson, Arizona
Website
mzbiolabs.com
ISO/IEC 17025
No claim on its sitePublishes a DEA registration (RP0584676); no ISO/IEC 17025 claim on its site, and no public lookup.laboratory site read 30 Sept 2026
Attributed by vendors
No vendor using only this laboratory records an accreditation for it.
Report lookup
No public lookup found

What its certificates report

30 lots
Assayed purity

28 of 30 lots at 99% or above; mean 99.64%.

02550<95%: 0 lots<95%95–97%: 0 lots95–97%97–98%: 0 lots97–98%98–99%: 2 lots98–99%99–99.5%: 6 lots99–99.5%≥99.5%: 22 lots22≥99.5%
Assayed purity
Rangelots
<95%0
95–97%0
97–98%0
98–99%2
99–99.5%6
≥99.5%22
Assayed mass vs label

53% of lots within 5% of the labelled mass; median gap 4.4%.

01020≤2%: 13 lots13≤2%2–5%: 3 lots2–5%5–10%: 2 lots5–10%10–20%: 7 lots10–20%>20%: 5 lots>20%
Assayed mass vs label
Rangelots
≤2%13
2–5%3
5–10%2
10–20%7
>20%5

These figures describe what the laboratory reported about the samples it received. They are a property of those samples and of the vendors that sent them, not a rating of the laboratory.

Vendors using this laboratory

VendorCertificates from this lab
Ascension Peptides30

Certificates

All certificates
AssayedCompoundVendorLotPurityLabel → assayedDocument
10 Apr 2026AOD-9604Ascension Peptides09-0126022999.45%5 mg → 4.56 mgOpen
10 Apr 2026CJC-1295Ascension Peptides13-0126022999.27%5 mg → 4.96 mgOpen
20 Mar 2026IpamorelinAscension Peptides59-0326042999.61%13.14 mg → 13.08 mgOpen
24 Feb 2026MOTS-cAscension Peptides24-0126022999.71%10 mg → 9.42 mgOpen
24 Feb 2026ARA-290Ascension Peptides53-1225012999.93%10 mg → 9.99 mgOpen
24 Feb 2026CagrilintideAscension Peptides01-0126022999.96%10 mg → 10.15 mgOpen
24 Feb 2026SemaglutideAscension Peptides04-0126022999.98%5 mg → 5.2 mgOpen
10 Feb 2026TB-500Ascension Peptides31-0126022999.97%5 mg → 4.89 mgOpen
10 Feb 2026Melanotan IAscension Peptides22-0126022999.48%10 mg → 9.52 mgOpen
10 Feb 2026PT-141Ascension Peptides28-0126022999.47%10 mg → 8.15 mgOpen
10 Feb 2026DSIPAscension Peptides14-0126022999.74%10 mg → 13.68 mgOpen
10 Feb 2026IpamorelinAscension Peptides06-0126022999.86%12.73 mg → 12.73 mgOpen
9 Feb 2026SemaxAscension Peptides30-0126022999.75%10 mg → 10.12 mgOpen
7 Feb 2026SermorelinAscension Peptides38-0126022999.79%10 mg → 11.31 mgOpen
7 Feb 2026TirzepatideAscension Peptides35-0126022999.95%30 mg → 33.42 mgOpen
7 Feb 2026Thymosin Alpha-1Ascension Peptides33-0126022999.44%10 mg → 12.94 mgOpen
7 Feb 2026TirzepatideAscension Peptides05-0126022999.89%10 mg → 11.47 mgOpen
7 Feb 2026SelankAscension Peptides29-0126022999.32%10 mg → 12.29 mgOpen
7 Feb 2026TesamorelinAscension Peptides32-0126022999.93%5 mg → 5.83 mgOpen
7 Feb 2026BPC-157Ascension Peptides46-0126022999.81%91.5 mg → 90.65 mgOpen
28 Jan 2026RetatrutideAscension Peptides03-0126022999.94%10 mg → 11.67 mgOpen
28 Jan 20265-Amino-1MQAscension Peptides36-0126022999.5%10 mg → 12.79 mgOpen
26 Jan 2026NAD+Ascension Peptides25-0126022999.66%1000 mg → 784.32 mgOpen
26 Jan 2026RetatrutideAscension Peptides43-0126022999.88%30 mg → 35.29 mgOpen
17 Sept 2025SS-31Ascension Peptides40-0725082899.53%10 mg → 9.95 mgOpen
17 Sept 2025AOD-9604Ascension Peptides09-0325042899.76%5 mg → 4.99 mgOpen
17 Aug 20255-Amino-1MQAscension Peptides2025-08-0798.44%10 mg → 9.84 mgOpen
12 Aug 2025CJC-1295Ascension Peptides2025-08-2098.67%5 mg → 4.93 mgOpen
30 Jun 2025KPVAscension Peptides2025-06-1099.76%10 mg → 9.98 mgOpen
6 Jul 2024IpamorelinAscension Peptides2024-06-0399.82%5 mg → 4.99 mgOpen