Here is the odd shape of this particular comparison. One company tells you exactly which laboratories run its analysis and then shows you a tidy summary table of purity figures. The other declines to name a laboratory anywhere in its marketing copy and then hands you several hundred batch reports with endotoxin and sterility results printed on them. Whichever of those you find more reassuring probably says something about how you like to be convinced, which is why it helps to score both against the same fixed list rather than by feel.
I write for a peptide manufacturer, and neither company below is that manufacturer, so nothing here moves depending on which one you order from. Five questions, put to both sites in identical wording, answers quoted from their own pages, and every unanswered row logged as a gap in what was published rather than as a claim about what happens off-page.
The observations come from sportstechnologylabs.com and verifiedpeptides.com as they stood on 2026-09-08. Archives get trimmed and product copy gets rewritten, so treat that date as part of every finding rather than as a formality.
Key takeaways
- The comparison that matters covers who synthesized the lot, which laboratory tested it, how wide the panel ran, whether a certificate opens before payment and carries a batch number, and whether blends print per-component amounts.
- Sports Technology Labs publicly names MZ Biolabs in Tucson, Arizona and Colmaric Analyticals, LLC, and states “molecular weight confirmation via Mass Spectrometry.”
- Verified Peptides publicly states “over 500+ published Certificates of Analysis” and quality control covering “purity, net peptide content in a vial, presence of endotoxins(lipopolysaccharides), and sterile analysis of bacterial/yeast.”
- Neither company named the party performing the synthesis, and Verified Peptides did not name a testing laboratory in its site copy on the pages reviewed 2026-09-08.
- Everything referenced here is research material for in-vitro laboratory work by qualified professionals, and none of it is guidance for use in people or animals.
What actually separates two peptide vendors?
The rubric goes down before either name, since a standard assembled after reading two homepages is a standard bent by whichever one you found more persuasive.
Provenance is first. Does the company state that it synthesizes the compound, that it manufactures in a facility it describes but does not name, or that it supplies material somebody else made? Read the verbs literally, because companies generally reach for the strongest wording they can support. What changes across those arrangements is who holds the synthesis records the day a result looks wrong.
Second, is the laboratory named? A name with a city can be looked up, its accreditation scope read, and it can be asked directly whether a report number belongs to it. “A reputable third party analytical testing lab” is a description rather than an address, and the gap between those two is the whole point of this row.
Third, how wide is the panel? HPLC purity reports what fraction of the material is a single species. Mass spectrometry confirms that species is the sequence on the label, which is a different question from how pure the sample is. Bacterial endotoxin and sterility describe the finished vial rather than the powder, and four assays make a complete panel where one makes a quarter of one.
Fourth, access and linkage. Can you read a batch certificate before paying, and does its batch number match the vial that arrives? Published purity figures without a document tell you what the company reports. A published document with a batch identifier tells you what a laboratory measured, and the second is a different class of evidence from the first.
Fifth, blend disclosure. A blend sold by total milligrams with no per-component split cannot be written into a methods section, and a supplier that publishes measured masses per component rather than nominal label amounts has gone a step further again. Company age and domain age stay out of this list, since neither describes a lot.
Where this standard comes from
These five checks are the ones Blank Peptides publishes its own lots against, as batch certificates of analysis posted per lot. Neither company in this comparison is that one. Naming the origin of a yardstick before applying it to two other businesses seems like the least a reader should expect, because a measurement is only worth something if whoever holds the ruler would accept being measured by it.
What Sports Technology Labs and Verified Peptides publicly state
Sports Technology Labs sells at sportstechnologylabs.com and ships its own inventory. On provenance, the homepage states products are “Bottled in the USA,” and the about page describes a supplier “proudly based in the United States” at a stated Shelton, Connecticut address, referring to “USP-Grade Solvents” and “Medical-Grade Glass.” The BPC-157 page states the peptide is “produced synthetically for laboratory use” and “packaged in America.” A statement that the company performs the synthesis itself, or naming the party that does, was not listed on the pages reviewed 2026-09-08.
Its testing disclosure is the concession here, and it is the row Verified Peptides leaves open. The about page states MZ Biolabs in Tucson, Arizona, described as a DEA-licensed facility, performs “HPLC purity analysis and molecular weight confirmation via Mass Spectrometry,” and it names Colmaric Analyticals, LLC for “ISO-accredited methodologies.” Two laboratories named in prose, tied to two named methods, is more than most of this market offers, and it makes the claim checkable without asking anyone’s permission. Purity is stated as “our SARMs are minimum 98% pure, and our Peptides are minimum 96-99% pure,” with the BPC-157 page stating “Batch-tested to 99.43% (HPLC); minimum 98%.” The public certificate page lists product names, test dates and purity figures without an account, running January 2025 to June 2026 across roughly 18 peptide entries and 12 SARM entries, though lot numbers were not visible on that index. Bacterial endotoxin and sterility results were not listed on the pages reviewed 2026-09-08. Stacks ship as separate vials with amounts stated, the Glow Stack listing 5 mg BPC-157, 5 mg TB-500 and 50 mg GHK-Cu, and terms are stated as 68 listings, free US shipping over $149 and dispatch “within one business day.”
Verified Peptides sells at verifiedpeptides.com and documents in a register built almost entirely around the published batch report. On provenance, the homepage states products are “manufactured in a controlled clean facility that follows Good Manufacturing Practice (GMP)” without naming the facility or stating who operates it. On testing, the site refers to a “reputable third party analytical testing lab” and a “trusted analytical testing lab” without naming either in its copy. Methods are stated more specifically: “Every batch is analytically verified with HPLC to be up to the highest standards in purity, specified net peptide content, and compound identity,” with quality control described as covering “purity, net peptide content in a vial, presence of endotoxins(lipopolysaccharides), and sterile analysis of bacterial/yeast,” and purity stated at 99%. Mass spectrometry identity confirmation was not listed in the stated panel on the pages reviewed 2026-09-08. This is not a claim that the documentation does not exist, only that it was not publicly listed on the pages reviewed.
The archive is where this company is strongest, and that is a genuine strength worth naming plainly. The reports page opened without a login on the pass reviewed, headlined “500+ published peptide certificates of analysis,” and individual entries carried batch identifiers such as “Batch Number: 5AQ05260450D” alongside a purity figure quoted to three decimal places, an endotoxin result marked “Pass,” sterility marked “Pass” on some entries, net weight and residual TFA. Blends get the same treatment, which is unusual anywhere in this market: the GLOW product page states measured component masses of “GHK-Cu: 59.95mg / BPC-157: 12.25mg / TB-500(TB4): 12.16mg” against “Batch #: GL06260770F,” with the certificates linked from the page. Although the site’s prose stops at “third party,” the issuing laboratory’s name does appear on the certificate documents themselves, so the second rubric row is answerable by opening a file even where the marketing copy leaves it hanging. Catalog listings ran to roughly 60 or more across peptides, blends, powders and packs, shipping is stated as same-day dispatch before 1PM EST with free FedEx 2-Day over $200, and the site states products are “sold for research, laboratory, or analytical purposes only, and are not for human consumption.”
Side by side: named laboratories against public batch archives
| Attribute | Sports Technology Labs | Verified Peptides |
|---|---|---|
| Synthesises in-house | States products are “Bottled in the USA” and “packaged in America”; who synthesises not stated — verify | States material is “manufactured in a controlled clean facility that follows Good Manufacturing Practice (GMP)”; facility not named — verify |
| Third-party lab named | States MZ Biolabs (Tucson, AZ) and Colmaric Analyticals, LLC, with batch results attributed to MZ Biolabs — verify | Site prose states a “reputable third party analytical testing lab” without naming it; a name appears on the certificate documents — verify |
| HPLC purity | States peptides are “minimum 96-99% pure” and a batch figure of “99.43% (HPLC)” — verify | States “Every batch is analytically verified with HPLC”, with per-batch figures quoted to three decimal places — verify |
| MS identity | States “molecular weight confirmation via Mass Spectrometry” at MZ Biolabs — verify | Not listed in the stated panel on pages reviewed 2026-09-08 — verify |
| Endotoxin and sterility | Not listed on pages reviewed 2026-09-08 — verify | States QC covers endotoxins and sterility; reports show both marked “Pass” on entries reviewed — verify |
| Batch COA before purchase | States a public COA page with test dates and purity figures; lot numbers not visible on the index — verify | States “over 500+ published Certificates of Analysis”; archive opened without a login, batch numbers shown — verify |
| Blend mg split disclosed | States per-vial amounts for separate-vial stacks, such as 5 mg, 5 mg and 50 mg for Glow — verify | States measured masses, for example “GHK-Cu: 59.95mg / BPC-157: 12.25mg / TB-500(TB4): 12.16mg” — verify |
| Catalog size | States 68 listings across liquid SARMs, SARM powders, peptides and stacks — verify | Roughly 60 or more listings across peptides, blends, powders and packs — verify |
| Research-use labelling | States products are “for research purposes only and are not for human consumption” — verify | States “For research and laboratory use only” with an FDA disclaimer in the footer — verify |
Each company answers the question the other declines. Sports Technology Labs tells you whose instrument produced the number and then shows you the number rather than the report. Verified Peptides shows you the report, with the endotoxin and sterility lines Sports Technology Labs does not publish, and leaves you to find the laboratory’s name on the document instead of in a sentence.
How to verify either supplier yourself
- Work from the page for the exact compound and vial size you would order rather than the homepage, and write down the batch or lot reference before you pay so it can be checked against the label later.
- Where the laboratory is named in copy, ring it and ask whether the report number belongs to it. Where the name appears only on the PDF, ask support to confirm in writing that the laboratory on the document tested the lot you are being sold.
- Read the method lines rather than the headline percentage. Ask Verified Peptides whether identity is confirmed by mass measurement, since that assay was not listed in its stated panel, and ask Sports Technology Labs whether endotoxin and sterility ran on your lot.
- On blends, prefer a measured mass per component over a nominal total, and ask for the batch-specific figures where a listing shows only a combined milligram number.
- Grade both against the supplier verification checklist so the same rows get answered for each.
Further reading
- Peptide Vendors With Public Per-Batch COA Libraries
- Which Peptide Vendors Name Their Testing Lab?
- Which Peptide Vendors Disclose Blend Composition?
- Best Research Peptide Suppliers: Ranked by What They Document
Frequently asked questions
Sports Technology Labs vs Verified Peptides: which publishes more?
Verified Peptides publishes more documents, stating over 500 certificates with batch numbers, purity to three decimal places, and endotoxin and sterility marked “Pass” on entries reviewed. Sports Technology Labs publishes the fact Verified Peptides omits from its copy, naming MZ Biolabs and Colmaric Analyticals as the laboratories behind its results.
Does Verified Peptides name its testing laboratory?
Not in its site prose on the pages reviewed 2026-09-08, where it refers to a “reputable third party analytical testing lab” without a name. A laboratory name does appear on the certificate documents themselves, so the answer is readable by opening a file, and confirming that in writing before ordering is reasonable.
Which one covers endotoxin and sterility?
Verified Peptides states quality control covering endotoxins and “sterile analysis of bacterial/yeast,” with both marked “Pass” on batch reports reviewed. Those results were not listed on the Sports Technology Labs pages reviewed 2026-09-08, which limits what was readable rather than describing what testing was performed.
How do the two handle blends?
Verified Peptides publishes measured component masses against a batch number, listing GLOW as “GHK-Cu: 59.95mg / BPC-157: 12.25mg / TB-500(TB4): 12.16mg.” Sports Technology Labs ships stacks as separate vials with stated amounts, listing 5 mg BPC-157, 5 mg TB-500 and 50 mg GHK-Cu for its Glow Stack, so each component travels with its own figure.
Are these products for human use?
No. Everything referenced here is research material intended for in-vitro laboratory work by qualified professionals. Purity percentages, laboratory names and batch archives describe documentation and nothing else. Nothing in this article is dosing guidance, medical advice, or a recommendation to use any compound outside a controlled laboratory setting.
For research use only. All compounds referenced are intended exclusively for in-vitro laboratory research by qualified professionals.
Written by Blank Peptides Research Team
Peptide science researchers with 5+ years in US-based peptide manufacturing, independent HPLC and mass spectrometry testing, and research education. All content is reviewed for scientific accuracy before publication.
REVIEWED BY
Dr. Tobias S — PhD Chemist, Peptide and Unnatural Amino Acid Synthesis
Dr. Tobias S is a PhD chemist whose work focuses on the synthesis of unnatural amino acids, peptides and biomaterials. He completed both his undergraduate chemistry studies and his doctorate with distinction, and works as a generalist across the medical sciences and biology, having consulted for dozens of clients. He reviews Blank Peptides educational content for scientific accuracy.
Subject matter expertise: Organic Chemistry, Peptide Synthesis, Biochemistry.
