You’ve got two tabs open, one for Blank Peptides and one for Polaris Peptides, and you’re trying to work out which one deserves your order. The trouble is that a head-to-head between peptide vendors usually collapses into price and vibes, because the sites are built to look trustworthy rather than to be checked. One has a nicer layout, one has a lower number on tirzepatide, and neither of those tells you what’s actually in the vial.
And with Polaris Peptides there’s a specific wrinkle, which is that most of the site sits behind a sign-in. You can’t open a product page, let alone a certificate, without creating an account. So the comparison you can do from the outside is narrower than usual, and I think it’s worth being honest about that rather than pretending I saw more than I did.
We’re Blank Peptides, so this is not a neutral referee’s report. What I can do is lay out the five documentation questions I’d ask of any vendor, answer them for us in plain terms, then report exactly what Polaris Peptides says on the pages a logged-out visitor can reach, with every claim attributed and every gap dated. The table in the middle is the part to screenshot.
Key takeaways
- Compare vendors on what they document and let you inspect: provenance, a named testing lab, the full test panel, a batch COA before purchase, and per-component blend disclosure.
- Blank Peptides synthesizes, vials, and QC-tests every lot in its own cGMP laboratory, then has Freedom Diagnostics and Horizon Analytical confirm identity, >99% purity, bacterial endotoxin, and sterility.
- Polaris Peptides publicly states that it “is now members only”, that it is “a chemical supplier” and not a compounding pharmacy, and that it offers a “Money Back Guarantee under specific Terms and Conditions”.
- A manufacturer, a named lab, a list of tests, a viewable COA, and any product or blend detail were not listed on the publicly accessible pages reviewed 2026-09-08.
- Both suppliers frame their products as research-use only, and nothing here is guidance on using any compound in people or animals.
What separates a documented vendor from a well-designed one?
Let me set the rubric before I bring in either name, because the criteria should be fixed before you know who they favour.
Provenance comes first. I want to know whether the vendor synthesizes what it sells or buys finished vials and puts a label on them. The tell is in the verbs. A manufacturer can say “we synthesize”, “our laboratory”, “our QC”, and describe the steps in between. A distributor tends to say “we supply” or “we provide” and describe its products in the passive voice. There’s nothing wrong with a distributor, but you should know who’s accountable when a lot is out of spec.
Second, is the testing lab named? A phrase like “third-party tested” without a name is impossible to check. When the lab is named, you can confirm it exists, see what methods it runs, and if you want to be thorough, send your own vial there for a comparison result.
Third, is it a full panel or purity only? HPLC gives you a purity percentage, and that’s where most certificates stop. Purity doesn’t confirm the compound is the right sequence, which needs mass spectrometry, and it says nothing about bacterial endotoxin or sterility, which matter as soon as the material touches cells. One number out of four is a partial answer.
Fourth, can you see a batch COA before you buy, and does the lot number on it match a lot number printed on the vial? A certificate that isn’t tied to a lot is a brochure.
Fifth, for blends, does the page state milligrams per component? “80mg” across four peptides is only a total, and you can’t reproduce anything from a total.
I’m leaving out company age and domain age on purpose. Neither can be verified from the outside, and neither tells you anything about the specific lot you’re about to receive.
How Blank Peptides makes and tests each lot
Blank Peptides runs its own cGMP laboratory in the USA and handles the whole process there: compounding, vialing, finishing, labelling, and in-house QC. The company does not buy finished vials from another party, so the chain of custody stays in one building from raw material to the shipping box, and the same process is applied when it contract-manufactures and fulfils product for other peptide brands.
Every lot is tested on a full panel rather than for purity alone. Identity is confirmed, purity is reported at >99%, and each lot is also tested for bacterial endotoxin and sterility. That work is done by two named outside laboratories, Freedom Diagnostics and Horizon Analytical, so a buyer can check the lab and not just the number.
Results are published per lot as batch certificates of analysis before purchase, and the lot number on each vial matches its certificate, which is what makes the document usable rather than ornamental. Lyophilized product carries an expiration of about 24 months.
The catalog is 34 compounds, deliberately narrower than many rivals, and every blend discloses composition per component: GLOW is 70mg as GHK-Cu, BPC-157, and TB-500; KLOW is 80mg and adds KPV; Wolverine is 20mg of BPC-157 and TB-500. Processing time is within 1 business day, and orders ship at room temperature, which is standard for lyophilized peptides. The company has been in business for five years.
What Polaris Peptides publicly states
Polaris Peptides operates at polarispeptides.com. On the pages reviewed 2026-09-08, the homepage, shop, both product category pages, the about page, and the contact page each displayed the same gate: “Polaris Peptides is now members only. Please sign in to your account or sign up for a new account to enter the site.” The navigation lists two categories, “GLP-1 & GIP Analogues” and “Topical Peptides”, and an “All Products” link, but no product names, prices, or descriptions were visible to a logged-out visitor.
On provenance, the site describes itself in regulatory terms rather than manufacturing ones. It states on every page reviewed that “Polaris Peptides is a chemical supplier”, that it “is not a compounding pharmacy or chemical compounding facility as defined under 503A of the Federal Food, Drug, and Cosmetic act”, and that it “is not an outsourcing facility as defined under 503B”. A manufacturer, a facility, or any verb like “synthesize” or “manufacture” was not listed on the public pages reviewed 2026-09-08.
On testing, the picture from outside the login is simply blank. A named laboratory, HPLC or mass spectrometry, endotoxin or sterility results, and a viewable certificate of analysis were not listed on the pages reviewed 2026-09-08. The “Our Guarantee” and “Payment & Shipping” pages returned an access error when I tried them, so their content couldn’t be reviewed, and blend composition couldn’t be assessed because no product pages were visible. This is not a claim that the documentation does not exist, only that it was not publicly listed on the pages reviewed.
What the public pages do state is a firm research-use framing and a guarantee. The site says “Our chemicals are crafted for research and/or investigative purposes and are not suitable for direct human consumption or consumers, nor are they intended for clinical or therapeutic use”, and that “all products are sold purely for research purposes only”. It adds: “For complete confidence in our quality commitment, we offer a Money Back Guarantee under specific Terms and Conditions.” The contact page lists a support email, a toll-free US phone number, and a map marker in Washington, DC.
I’ll give Polaris Peptides its due here. A stated money-back guarantee and a phone number a buyer can actually call are more than many vendors in this category offer, and if you value being able to reach a person, that’s a real point in their favour. I’d also flag that a second domain, polarispeptidesusa.com, appears in search results next to the main site, but it did not resolve when I tried it on 2026-09-08, so nothing there was reviewed.
Side by side: manufacturing, named labs, and full-panel testing
| Attribute | Blank Peptides | Polaris Peptides |
|---|---|---|
| Synthesises in-house | Yes, own cGMP laboratory | States it is “a chemical supplier”; manufacturer or facility not listed on public pages reviewed 2026-09-08 — verify |
| Third-party lab named | Freedom Diagnostics and Horizon Analytical | Not listed on the public pages reviewed 2026-09-08 — verify |
| HPLC purity | >99% on every lot | Not listed on the public pages reviewed 2026-09-08 — verify |
| MS identity | Confirmed per lot | Not listed on the public pages reviewed 2026-09-08 — verify |
| Endotoxin and sterility | Tested per lot | Not listed on the public pages reviewed 2026-09-08 — verify |
| Batch COA before purchase | Public per lot at blankpeptides.com/coas/ | States the site “is now members only”; no COA visible before sign-in — verify |
| Blend mg split disclosed | Every blend, every component | Product pages not publicly visible on 2026-09-08 — verify |
| Catalog size | 34 compounds | States two categories, “GLP-1 & GIP Analogues” and “Topical Peptides”; count not visible — verify |
| Research-use labelling | Research use only, on every product | States products are “sold purely for research purposes only” |
How to verify either supplier yourself
- Open a product page and a certificate as a logged-out visitor on each site. If one of them requires an account before you can read anything, email support and ask for a sample lot-numbered COA before you register.
- On any certificate you receive, read the method lines. HPLC gives purity; look for mass spectrometry for identity and separate lines for bacterial endotoxin and sterility. If a line is missing, ask whether it exists for that lot.
- Search the name of the testing lab. A real analytical business has an address, a phone number, and a published scope of services. A name that returns nothing is a question, not a verdict.
- After delivery, match the lot number on the vial to the lot number on the certificate. If the vial has no lot, the certificate can’t be tied to your shipment.
- Score both vendors on the same five points with the supplier verification checklist, so the comparison rests on documentation rather than on which site looks better.
Further reading
- Which Peptide Vendors Name Their Testing Lab?
- Who Actually Manufactures Research Peptides in the USA?
- Peptide Vendors With Public Per-Batch COA Libraries
- Best Research Peptide Suppliers: Ranked by What They Document
Frequently asked questions
How do Blank Peptides and Polaris Peptides compare?
On the five documentation points, Blank Peptides publishes a named lab, a full panel, a per-lot COA, and blend splits on public pages. Polaris Peptides keeps its catalog behind a sign-in, so those points couldn’t be assessed from outside on 2026-09-08. Polaris does state a money-back guarantee and lists a phone number, which is more than many vendors offer.
Does Polaris Peptides name its testing lab?
Not on the publicly accessible pages reviewed 2026-09-08. The site’s public prose describes the company as “a chemical supplier” and carries research-use disclaimers, but a laboratory name, a testing method, or a certificate wasn’t visible without an account. That doesn’t mean one doesn’t exist behind the login; it means you’ll need to ask for it.
Which vendor shows a COA before purchase?
Blank Peptides publishes a lot-numbered certificate for every lot at blankpeptides.com/coas/, viewable without an account. Polaris Peptides states that the site “is now members only”, and no certificate was visible to a logged-out visitor on 2026-09-08. If you register there, ask for the certificate tied to the exact lot you’d receive.
Does a members-only site mean a vendor is hiding something?
No, and I’d resist that leap. Some suppliers gate their catalog to screen who’s buying, and that’s a defensible choice for research-use material. What it does mean is that you can’t evaluate the documentation before you hand over your details, so the burden shifts to you to ask for a certificate first.
Are these products for human use?
No. Every compound referenced here, from either supplier, is sold for in-vitro laboratory research only. Polaris Peptides states its products are “not suitable for direct human consumption”, and Blank Peptides labels every vial research use only. Nothing on this page is guidance on dosing, administration, or use in any person or animal.
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.
