Here’s the thing nobody says out loud about comparing research suppliers: most of the differences you notice on a first read are differences in web design budget. One site has better photography and a cleaner grid, so it feels more legitimate, and that feeling has almost no relationship to whether the company can hand you a document tying a laboratory result to the vial in your hand.
The only way I know to get past that is to fix the questions before you open either site. Five of them, asked in the same order of both companies, answered strictly from what appeared on the page rather than what the page implied. That’s what this piece does with Sports Technology Labs and Polaris Peptides. No winner gets declared, because I haven’t tested either company’s material and disclosure practice isn’t the same thing as product quality.
I write for a peptide manufacturer, so I’ll name where my standard comes from instead of pretending it fell out of the sky. Neither company below is that manufacturer. Everything here was publicly readable on the pages I reviewed on 2026-09-08.
Key takeaways
- A purity figure standing alone is close to meaningless; a named laboratory, a named method and a lot number matching your vial are what turn it into something checkable.
- Sports Technology Labs names MZ Biolabs of Tucson, Arizona with a DEA license number and Colmaric Analyticals, LLC, states HPLC and mass spectrometry, and publishes an ungated certificate page.
- Polaris Peptides states that “every batch is sent to an independent third-party laboratory for HPLC analysis,” and publishes per-component milligrams for its GLOW 50 and KLOW blends.
- Neither site named the entity that performs the synthesis, and neither published endotoxin or sterility results on the pages reviewed 2026-09-08.
- Everything referenced here is research material for in-vitro laboratory work by qualified professionals.
Which five questions decide a documentation comparison?
Fixing the criteria before naming either company matters, because a rubric built after reading two sites quietly rewards whatever those two sites already do well.
Provenance comes first. Does the company state that it synthesizes the material, or does it describe supplying, sourcing, curating or distributing it? The verbs on an about page carry more information than any adjective sitting beside them. Distribution is a legitimate business and there are careful distributors, but a distributor’s certificate begins with an upstream party whose identity you may not be given.
Second, is the testing laboratory named? Binary, quick, and more revealing than almost anything else on a site. A named lab has an address, a phone number and staff who will confirm whether a report number belongs to them. An unnamed “independent third-party laboratory” is a phrase with nothing behind it that you can dial.
Third, how wide is the panel? HPLC purity measures how much of the powder is a single compound. Mass spectrometry confirms that compound is the one on the label. Bacterial endotoxin and sterility describe the finished vial rather than the powder, and those two are the results most often missing from public pages. A supplier publishing purity alone has answered about a quarter of what you’re actually asking.
Fourth, can you read a batch certificate before you pay, and does its lot number appear on the vial that arrives? Both conditions together are what turn a document into evidence about your specific material.
Fifth, for blends, are the milligrams of each component stated? A total weight with an ingredient list underneath describes something nobody can reproduce or calculate against. Company age and domain age appear nowhere in this rubric, because neither says anything about a specific lot.
Where this standard comes from
These five checks came from somewhere and I’d rather say where. They’re the criteria Blank Peptides publishes its own lots against: synthesis in an in-house cGMP laboratory, testing laboratories named on the site, a per-lot panel covering identity, purity, bacterial endotoxin and sterility, batch certificates of analysis tied to the lot number printed on the vial, and blend composition disclosed per component. Neither company in this comparison is that manufacturer, and knowing where the bar came from lets you disagree with its height.
What Sports Technology Labs publicly states
Sports Technology Labs operates at sportstechnologylabs.com, and on the laboratory question it’s among the most forthcoming sites in this market.
On provenance, the about page describes a US-based operation and gives a headquarters address of “494 Bridgeport Avenue, Suite 101-222, Shelton, CT 06484.” Across the pages I read, the verbs stay on sourcing, testing and supplying. A statement that Sports Technology Labs performs the synthesis itself, or a named manufacturing partner, was not listed 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.
Testing is where the site gets specific, and it names two laboratories rather than one. The about page names MZ Biolabs of Tucson, Arizona, describing it as a “US DEA Schedule III licensed facility (License: RP0584676),” and names Colmaric Analyticals, LLC, crediting it with “over 15 years of scientific expertise.” High-Performance Liquid Chromatography is named as the method for detecting impurities, and Mass Spectrometry as the method that confirms chemical identity. On purity, the page states “SARMs maintain a minimum 98% purity and peptides reach up to 99% purity.”
Certificates live on a public page headed “Certificates of Analysis,” which states that “as part of our continuous commitment to quality, we test every batch of our SARMs for a minimum of 98% purity. Below are our most recent third-party COAs (certificates of analysis) for each product.” On the review date it listed 12 SARM entries and 20 peptide entries, each with a product name, a test date and a purity figure, spanning 31 January 2025 to 10 June 2026. Lot or batch numbers weren’t among the fields, and individual entries weren’t attributed to either named laboratory. Bacterial endotoxin and sterility results were not listed on the pages reviewed, and a single-vial blend with a per-component milligram split wasn’t listed either.
The concession is their strongest row and it’s a real one. Naming two laboratories, one with a DEA license number a reader can look up without permission from anybody, is more than most vendors here will do. The about page also states a 60-day money-back guarantee, flat $8 domestic shipping with free shipping above $149, same-day dispatch on most orders and typical US delivery in two to five business days.
What Polaris Peptides publicly states
Polaris Peptides trades at polarispeptides.org, and its documentation profile is close to the inverse of the one above: thinner on who it is, better on what’s in the vial.
On provenance, a statement about who synthesizes the peptides was not listed on the pages reviewed 2026-09-08. The site doesn’t describe a facility it operates, and it doesn’t describe suppliers or partners either, so this row sits unanswered rather than answered in one direction. Sports Technology Labs at least gives you a corporate address to start from, which is a small advantage worth noting.
On testing, the homepage states that “every compound in our catalog is independently tested to 99%+ purity” and that “every batch is sent to an independent third-party laboratory for HPLC analysis.” That’s a clear commitment on one assay, tied to a stated point in the process, which is more specific than a generic testing claim. The laboratory’s name was not listed on the pages reviewed, and mass spectrometry, bacterial endotoxin and sterility results were not listed either. So identity confirmation and contamination testing both remain open, and on method breadth Sports Technology Labs states more.
On certificate access, the site states “Independent lab results published on every product page. Check the data before you order, no request needed.” That’s a strong claim and one worth testing yourself, because on the BPC-157 product page I reviewed on 2026-09-08, no certificate, lab result or lot number was visible alongside the price and size options. A certificate library at a dedicated address also did not resolve during the review. I’d read the homepage statement as a promise to check against the specific product you want rather than a settled row, since a page that didn’t load is a limit on my reading rather than evidence about their records.
On blends, Polaris Peptides does well, and this is the concession I’ll make without qualification. The shop lists GLOW 50 as “GHK-Cu 35mg, TB-500 10mg, BPC-157 5mg,” KLOW as “GHK-Cu 50mg, KPV 10mg, TB-500 10mg, BPC-157 10mg,” and a third blend as “TB-500 10mg / BPC-157 10mg.” Every component carries a number, which is more than most of this market publishes, and it means a researcher can calculate a working concentration from the listing alone. The catalog itself is small, at roughly 11 listings on the review date, with categories spanning BPC-157, TB-500, NAD+, GLP-1 analogues and research blends. Shipping is stated as prompt FedEx dispatch with tracking, free above $100, which is a low threshold by market standards. Research-use wording was not listed on the pages reviewed 2026-09-08.
Side by side: named laboratories versus blend disclosure
| Attribute | Sports Technology Labs | Polaris Peptides |
|---|---|---|
| Synthesises in-house | States a US-based operation with a Shelton, CT headquarters; who synthesises — verify | No statement about who synthesises listed on the pages reviewed 2026-09-08 — verify |
| Third-party lab named | States MZ Biolabs of Tucson, AZ with DEA license RP0584676, and Colmaric Analyticals, LLC | States an “independent third-party laboratory”; no name listed on the pages reviewed — verify |
| HPLC purity | States HPLC for impurity detection, peptides “up to 99% purity” | States every batch sent for HPLC analysis at “99%+ purity” before listing |
| MS identity | States Mass Spectrometry to confirm chemical identity | Mass spectrometry not listed on the pages reviewed 2026-09-08 — verify |
| Endotoxin and sterility | Neither listed on the pages reviewed 2026-09-08 — verify | Neither listed on the pages reviewed 2026-09-08 — verify |
| Batch COA before purchase | Publishes an ungated page of product, test date and purity; lot numbers not shown — verify | States results are “published on every product page”; none visible on the page reviewed — verify |
| Blend mg split disclosed | Single-vial blends with per-component mg not listed on the pages reviewed — verify | States “GHK-Cu 35mg, TB-500 10mg, BPC-157 5mg” for GLOW 50 and a four-part split for KLOW |
| Catalog size | States 12 SARM and 20 peptide certificate entries across liquids, powders and stacks | Roughly 11 listings on the review date across peptides, GLP-1 analogues and blends |
| Research-use labelling | States products are supplied for laboratory research use only | Research-use wording not listed on the pages reviewed 2026-09-08 — verify |
How to verify either supplier yourself
- Ask both companies for the certificate covering the exact lot they’d ship you this week. That question separates a testing programme from a testing claim faster than any amount of reading.
- With Sports Technology Labs, use the fact that the labs are named. Contact MZ Biolabs or Colmaric Analyticals and ask whether a given report number is genuinely theirs.
- With Polaris Peptides, open the product page for the compound you actually want and check whether a lab result is attached, since the homepage states results appear on every product page and the one I opened showed none.
- Match whatever lot number you’re given against the number printed on the vial when it arrives, and ask both companies about mass spectrometry, bacterial endotoxin and sterility by name.
- Run both suppliers through the supplier verification checklist before a first order.
Further reading
- Which Peptide Vendors Name Their Testing Lab?
- Which Peptide Vendors Disclose Blend Composition?
- Peptide Vendors With Public Per-Batch COA Libraries
- Best Research Peptide Suppliers: Ranked by What They Document
Frequently asked questions
Sports Technology Labs vs Polaris Peptides: which one documents more?
They win different rows, which is why one ranking would mislead. Sports Technology Labs names two laboratories and publishes 32 dated certificate entries. Polaris Peptides publishes per-component milligrams for its blends, which Sports Technology Labs did not. Neither named a synthesizer, and neither listed endotoxin or sterility on the pages reviewed 2026-09-08.
Can you see a certificate before buying from either vendor?
From Sports Technology Labs, yes: an ungated page listing product name, test date and purity for 32 entries. Polaris Peptides states that independent lab results are published on every product page, but the BPC-157 page I opened on 2026-09-08 showed none, and a certificate library address did not resolve during the review.
Does either company name its testing laboratory?
Sports Technology Labs does, naming MZ Biolabs of Tucson, Arizona with license number RP0584676 and Colmaric Analyticals, LLC on its about page. Polaris Peptides refers to an independent third-party laboratory without naming it on the pages reviewed 2026-09-08, so ask them directly which laboratory ran your compound.
Which vendor discloses blend composition per component?
Polaris Peptides does, and it’s their strongest row. The shop lists GLOW 50 as “GHK-Cu 35mg, TB-500 10mg, BPC-157 5mg” and KLOW as “GHK-Cu 50mg, KPV 10mg, TB-500 10mg, BPC-157 10mg.” A single-vial blend with per-component milligrams was not listed on the Sports Technology Labs pages reviewed 2026-09-08.
Are these products for human use?
No. Everything referenced here is research material for in-vitro laboratory work by qualified professionals. Nothing in this article is dosing guidance or medical advice, and research-use wording was not listed on the Polaris Peptides pages reviewed 2026-09-08, which is itself worth asking about.
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.
