The frustrating thing about comparing peptide vendors is that the sites which document least often look the most confident, and the ones documenting properly bury the good part three clicks down. Both of these companies name a testing laboratory in plain text, which already puts them ahead of most of what you will find, and both publish something you can read before paying. Where they part company is on the question of whether the document you open can be matched to the vial that shows up.
I write for a peptide manufacturer, and neither company below is that manufacturer, so the scoring does not bend toward either of them. What follows is five questions put to both sites in identical wording, with the answers quoted from their own pages and every blank recorded as a gap in what has been published rather than as a claim about what happens off-page.
The observations come from sportstechnologylabs.com and protidehealth.com as they stood on 2026-09-08. Certificate archives get pruned, product pages get rewritten, and a company can add an assay next month that it did not list last week, so the date belongs alongside every finding rather than in a footnote.
Key takeaways
- The five rows worth comparing are who synthesized the lot, which laboratory tested it, how wide the panel ran, whether a certificate opens before payment and carries a lot number, and whether blends print per-component milligrams.
- Sports Technology Labs publicly names MZ Biolabs in Tucson, Arizona and Colmaric Analyticals, LLC, stating “HPLC purity analysis and molecular weight confirmation via Mass Spectrometry.”
- Protide Health publicly states that “Every batch is independently tested by Freedom Diagnostics, a third-party U.S. laboratory,” with a public archive showing both COA numbers and lot numbers.
- Neither company named the party performing the synthesis, and sterility results were not listed in either company’s stated panel 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 should decide between two vendors that both name a lab?
The rubric goes down before either name, because a standard written after reading two sites is a standard shaped by whichever one you liked reading.
Provenance leads. Does the company state that it makes the material, that it partners with facilities that make it, or that it supplies material somebody else made? All three are real business models and more than one of them carries good product. What differs is who can account for a lot when a result comes back looking wrong, so read the verbs rather than the adjectives around them.
Second, is the laboratory named? A name with a city can be looked up, its accreditation scope read, and it can be asked whether a report number belongs to it. That single fact does more work than any purity banner, because it moves the claim from something the vendor asserts to something you can check without the vendor’s cooperation.
Third, how wide is the panel? HPLC purity reports what fraction of the material is a single species. Mass spectrometry, or LC-MS, confirms that species is the sequence on the label. Bacterial endotoxin and sterility describe the finished vial rather than the powder, and they are separate assays run by separate methods. Identity, purity, endotoxin and sterility together make a complete panel, and any site publishing three of the four is doing better than most.
Fourth, access and linkage. Can you open a batch certificate before paying, and does the lot number on that certificate also appear on the vial that arrives? Access without linkage shows you the company’s general standard. Linkage without access asks you to buy first and read second. Both together are what make a PDF into evidence about your material.
Fifth, blend disclosure. A blend priced by total milligrams with no per-component split cannot be written into a methods section, so the split is the difference between a citable product and a decorative one. Company age stays off the list, since it describes a business rather than 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. Saying where a yardstick came from before applying it to two other businesses is the honest move, since a measurement counts for something only if whoever holds the ruler would accept being measured by it.
What Sports Technology Labs and Protide Health 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.
On testing, 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 names Colmaric Analyticals, LLC for “ISO-accredited methodologies.” 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%.” Two things here deserve credit. Its certificate page opens without an account and carries test dates spanning January 2025 to June 2026 across roughly 18 peptide entries and 12 SARM entries, which gives you a run of history rather than a snapshot. And its 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, so each component can in principle be traced to its own document instead of hiding inside a mixed vial. Lot numbers were not visible on that certificate index, and bacterial endotoxin and sterility results were not listed on the pages reviewed 2026-09-08. Terms are stated as 68 listings, free US shipping over $149, dispatch “within one business day,” and a 60-day exchange on unused items.
Protide Health sells at protidehealth.com and documents in an unusually complete way for a storefront of its size. On provenance, the about page states “We partner with ISO-certified and GMP-compliant facilities to ensure every compound is synthesized to the highest institutional standards,” with the homepage adding that compounds are “Synthesized in ISO 9001:2015 certified facilities.” Those facilities were not named on the pages reviewed 2026-09-08, so the row is answered in kind without being answered by name.
On testing, the company names the analytical side outright: “Every batch is independently tested by Freedom Diagnostics, a third-party U.S. laboratory.” The stated panel is specific, covering “identity by liquid chromatography and mass spectrometry (LC-MS), purity by high-performance liquid chromatography with UV detection (HPLC-UV), endotoxin by LAL assay (USP <85>), and net content,” and the site states “Certificates of Analysis (COAs) are published for every compound.” The archive backs that up, and this is the concession. It opened without a login on the pass reviewed, listing certificates carrying both a COA number and a lot number in the format “COA: 2608240764” and “Lot: PH-nasn10-0609,” offering PDF viewing and download, with the footer stating “152 public third-party COAs from the last 180 days.” Product pages carry the same linkage, and the Klow blend page states “80mg lyophilized powder in 3mL vial. Contains: GHK-Cu (50mg), KPV (10mg), BPC-157 (10mg), TB-500 (10mg)” with two lot-specific certificates linked from the page. A named laboratory, a lot-numbered public archive and printed blend milligrams close three rubric rows in one place, which very little of this market manages. Catalog pages showed 83 products across six categories, shipping is stated as “2-3 Day US Delivery Free shipping over $199,” and products are stated to be “supplied for laboratory research only and are not for human or animal consumption.” The gap on the pages reviewed 2026-09-08 is sterility, which was not among the four assays in the stated panel. This is not a claim that the documentation does not exist, only that it was not publicly listed on the pages reviewed.
Side by side: lot-numbered archives and blend disclosure
| Attribute | Sports Technology Labs | Protide Health |
|---|---|---|
| Synthesises in-house | States products are “Bottled in the USA” and “packaged in America”; who synthesises not stated — verify | States it partners with “ISO-certified and GMP-compliant facilities”; facilities not named — verify |
| Third-party lab named | States MZ Biolabs (Tucson, AZ) and Colmaric Analyticals, LLC, with batch results attributed to MZ Biolabs — verify | States “Every batch is independently tested by Freedom Diagnostics, a third-party U.S. laboratory” — verify |
| HPLC purity | States peptides are “minimum 96-99% pure” and a batch figure of “99.43% (HPLC)” — verify | States “purity by high-performance liquid chromatography with UV detection (HPLC-UV)” — verify |
| MS identity | States “molecular weight confirmation via Mass Spectrometry” at MZ Biolabs — verify | States “identity by liquid chromatography and mass spectrometry (LC-MS)” — verify |
| Endotoxin and sterility | Not listed on pages reviewed 2026-09-08 — verify | States “endotoxin by LAL assay (USP <85>)”; sterility not listed in the stated panel — 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 COAs published for every compound; archive opened without a login, with COA and lot 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 per-component milligrams, for example “GHK-Cu (50mg), KPV (10mg), BPC-157 (10mg), TB-500 (10mg)” — verify |
| Catalog size | States 68 listings across liquid SARMs, SARM powders, peptides and stacks — verify | Lists 83 products across six categories — verify |
| Research-use labelling | States products are “for research purposes only and are not for human consumption” — verify | States products are “supplied for laboratory research only and are not for human or animal consumption” — verify |
The row that separates them is linkage. Both name a laboratory and both let you read something without an account, but only one of the two published documents carrying a lot number you could match against a vial on the pages reviewed 2026-09-08.
How to verify either supplier yourself
- Work from the page for the exact compound and vial size you would order, not the homepage, and note any lot or COA reference before you pay so you can check it against the label later.
- Contact the named laboratory yourself. Both companies give you a name, so ask MZ Biolabs or Freedom Diagnostics whether the report number you were shown belongs to them and whether peptide analysis sits inside their scope.
- Read the method lines rather than the headline percentage, and ask specifically about sterility, since neither company listed a sterility result in its stated panel on the pages reviewed 2026-09-08.
- Where a certificate index shows purity and a date without a lot number, ask support for the lot-specific file covering the vial they would ship you this week, then compare it against the published summary.
- Run both through the supplier verification checklist so each gets graded on identical rows.
Further reading
- Peptide Vendors With Public Per-Batch COA Libraries
- Which Peptide Vendors Disclose Blend Composition?
- Which Peptide Vendors Name Their Testing Lab?
- Best Research Peptide Suppliers: Ranked by What They Document
Frequently asked questions
Sports Technology Labs vs Protide Health: which documents more?
Protide Health fills more rows on its own pages, naming Freedom Diagnostics, stating a four-assay panel with method names, publishing an archive with COA and lot numbers, and printing blend milligrams per component. Sports Technology Labs names two laboratories and publishes a longer run of dated purity history, though without lot numbers on that index.
Do both name their testing laboratory?
Yes. Sports Technology Labs states MZ Biolabs in Tucson, Arizona and Colmaric Analyticals, LLC. Protide Health states “Every batch is independently tested by Freedom Diagnostics, a third-party U.S. laboratory.” Both names are checkable, and asking either laboratory to confirm a report number is a fair step before ordering.
Which one ties a certificate to a lot number?
Protide Health did on the pages reviewed 2026-09-08, showing entries formatted as “COA: 2608240764” and “Lot: PH-nasn10-0609” with PDFs readable without a login. The Sports Technology Labs certificate index showed product names, test dates and purity figures without visible lot numbers, so that linkage would need requesting.
Does either publish sterility results?
Neither listed sterility in its stated panel on the pages reviewed 2026-09-08. Protide Health states endotoxin by LAL assay under USP <85> without a sterility line, and Sports Technology Labs listed neither assay. If sterility matters for your work, request it in writing for your specific lot before ordering.
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 certificate 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.
