How We Score Peptide Vendors (and Why It's Public)

You searched "best peptide vendor 2026" and got ten ranked lists that all look suspiciously similar. The same five suppliers keep topping the charts. The "#1 pick" happens to be the one paying the highest affiliate commission. You already know this pattern. You want to know if PeptidesRated is doing anything different, or just running the same playbook with cleaner CSS.

Short answer: we publish the rubric, we run a public COA database at https://peptidesrated.com/coa, and we show our work on every supplier scorecard. Affiliate commissions exist. We disclose them on https://peptidesrated.com/about and they do not change a vendor's tier. Below is the whole mechanism, end to end, with the pages to verify it.

Most "best peptide vendor" lists are affiliate rankings in a trenchcoat

The sites telling you who to trust get paid when you click. That is not automatically bad. The FTC allows affiliate relationships as long as they are disclosed (16 CFR Part 255). What is bad is when the commission structure quietly determines the ranking. The #1 slot goes to whoever pays the most per click, the "runner-up" to whoever pays the second most, and the methodology section, if it exists at all, reads like "we considered quality, pricing, and reputation."

Honestly, the tell is almost always the same. There is no published rubric. There is no way to audit the scoring. There is no public testing database. You cannot check a batch number against anything. You just have to trust that the site's taste happens to match what is best for you, while the site is simultaneously earning a kickback on every click.

Here is what most readers miss: affiliate revenue is not the problem. Hidden methodology is. A site can take commissions and still be accurate if the scoring logic is public, the data is auditable, and the commissions do not move the order. That is the bar we try to clear. Whether we clear it is for you to decide after reading the rest of this page.

The COA lookup tool: search batch results across three labs

Type a batch number, see the actual test, skip the vendor's marketing page. That is the whole point of https://peptidesrated.com/coa. The hero copy says "Search thousands of verified COAs from 3 partnered labs by peptide, vendor, or batch number" and that is literally what it does.

The three labs indexed right now are Janoshik Analytical, Finnrick, and Freedom Diagnostics. You search by batch, peptide, or vendor. You get back the actual Certificate of Analysis: purity percentage, testing method, test date, pass/fail. If a vendor's batch does not show up, that is itself information. It means either the vendor has not posted a COA for that batch, or they do not publish COAs publicly at all. Both are worth knowing before you spend $90 on a vial.

If you want the mechanics of what a COA actually shows, we broke that down at https://peptidesrated.com/blog/how-to-read-a-peptide-coa, and the Janoshik-specific methodology at https://peptidesrated.com/blog/janoshik-testing-explained.

What most guides won't tell you: COA lookup tools are rare because they are annoying to maintain. You have to keep up with vendor batch drops, verify lab signatures, and accept that some vendors will quietly stop publishing once you start indexing them. We think the annoyance is the point. The tool works because someone bothered to build it.

In-house testing is a red flag, not a checkbox

If a vendor grades its own homework, we say so out loud. Some suppliers proudly list "HPLC testing" on the product page and link to a PDF on their own letterhead, with no third-party lab name, no analyst signature, no test method detail. That is not testing. That is a marketing asset.

Our scoring weights third-party lab testing at 40 percent of the total score. The key word is third-party. Verify on https://peptidesrated.com/about. An in-house COA without a named external lab does not count toward that 40 percent. It is not that we think every vendor running its own HPLC is lying. It is that a self-signed report has the same evidentiary weight as a restaurant reviewing its own food.

We wrote more about this pattern at https://peptidesrated.com/blog/7-red-flags-buying-peptides, with the in-house testing flag as one of the seven. The short version: if the only purity document a vendor will show you has their own logo on it, you have not actually seen a purity test.

Published rubric: 40/30/20/10, no secret algorithm

Testing 40, reviews 30, business practices 20, pricing 10. That is the whole trick. It is published on https://peptidesrated.com/about and it does not change based on what a supplier pays us.

The weights, in plain English:

The output is a tier: Tier 1 Recommended, Tier 2 Good Alternative, or Not Recommended. Tier 1 is the bar most readers are trying to find. Tier 2 is "fine, with caveats, and the caveats are on the scorecard." Not Recommended is where a vendor lands if testing is weak, reviews trend bad, or business practices are hostile.

The honest take: a 40/30/20/10 rubric is a blunt instrument. Any scoring system compresses a lot of nuance into one number. What the rubric buys you is auditability. If you disagree with a ranking, you can look at the component scores and see where we are weighting differently than you would. That is impossible on a site that will not tell you how the ranking was produced.

What a scorecard actually shows (walkthrough of a vendor page)

Rating, tier, lab partner, payment rails, returns policy, one screen. Open https://peptidesrated.com/supplier/ascension-peptides for a working example.

What you see on that page:

Compare that to https://peptidesrated.com/supplier/pure-peptide-labs (5/5 Trustpilot, HPLC plus Mass Spec testing, positioned as best value), https://peptidesrated.com/supplier/mile-high-compounds (4.9/5, 7-point batch testing plus cGMP and FDA-audited manufacturing, GLP-1 focus), and https://peptidesrated.com/supplier/verified-peptides (4.9/5, Janoshik testing, 400+ public COAs).

The point is that every scorecard uses the same fields. You can compare vendors on the same axes instead of squinting at four different "about us" pages written by four different marketing teams. If a vendor's returns policy is "all sales final" and you are buying an expensive research peptide, you want to know that before checkout, not after.

For the full table view of every indexed vendor, https://peptidesrated.com/compare shows 50+ providers side-by-side with rating, lab, payment methods, shipping regions, and a quick-visit link.

What we don't cover (and who does it better)

Dosing protocols live on PeptideDeck. Biohacker stacks live on Outliyr. Clinical telehealth lives on Innerbody. Vendor depth lives here. We are not trying to be everything.

If you want a dosing calculator or a stack for sleep optimization, https://peptidedeck.com has dozens of compound guides and an education-first structure. It is a knowledge base, not a vendor ranking, and that is by design.

If you want "here is what my morning stack looks like" lifestyle framing with vendor reviews wrapped in, https://outliyr.com/peptides does that well. Their focus is biohacking and performance optimization. They review vendors, but they do not index COAs.

If you want clinical telehealth providers vetted by an in-house medical review board, Innerbody Research is the category leader and honestly does that better than anyone else.

What we do is vendor depth. Scorecards for 20+ research-peptide suppliers, a COA database across three labs, a published rubric, and the willingness to put a vendor in the Not Recommended tier when the data says to. That narrow focus is the point. You do not need another generalist.

No pay-to-play, anonymous team, affiliate disclosure up front

Commissions exist. They do not move the tier. That is verbatim what https://peptidesrated.com/about communicates: the site may earn affiliate commissions on outbound clicks, but tier placement is "based entirely on testing verification, customer satisfaction, and transparency, not affiliate potential."

The team is anonymous on purpose. The composition is former researchers, data analysts, and community moderators from peptide forums. The reason to stay anonymous is industry pressure. When you write "Vendor X does not publish third-party COAs," Vendor X's marketing team starts emailing. Keeping the team off the public org chart cuts the channel.

On the regulatory side, FTC guidance under 16 CFR Part 255 requires that material connections between an endorser and a product be disclosed clearly and conspicuously. A link in the footer that says "we may earn commissions" meets that bar if the disclosure is actually visible, which is why our disclosure lives on the About page and not buried in Terms.

Here is what most guides won't tell you: disclosure alone is not the same as independence. A site can disclose commissions and still be a pure affiliate mill if the commission structure silently decides the ranking. The only way to know the difference is to check whether the methodology is public, whether the tier cutoffs are consistent across vendors, and whether low-paying vendors ever land in Tier 1. Ours do.

What your first visit should look like

Start at COA lookup, end at a supplier scorecard, decide in ten minutes. That is the intended flow.

Step one: go to https://peptidesrated.com/coa and search the vendor or peptide you are considering. If batch-level COAs from Janoshik, Finnrick, or Freedom Diagnostics come up, great. If nothing comes up, that is a yellow flag worth investigating.

Step two: open https://peptidesrated.com/compare and filter by rating or price. You will see all 20 vendors on one screen with lab partner, payment methods, and shipping region visible.

Step three: click into the scorecard for the two or three vendors you are comparing. Check testing partner, returns policy, and payment rails. If any of those are missing or hostile, that is your answer.

Step four: if you want the rubric detail, https://peptidesrated.com/about lays out the 40/30/20/10 weights and tier definitions. If you are curious about our affiliate disclosure, it is on the same page.

Ten minutes, four pages, a decision you can defend. That is what we are optimizing for. Not click-through volume. Not time-on-site. A reader who walks away with a vendor they can actually justify to themselves.

FAQ

Do affiliate commissions influence PeptidesRated rankings?

No. The scoring rubric (40% third-party testing, 30% reviews, 20% business practices, 10% pricing transparency) is applied uniformly. Affiliate commissions are disclosed on https://peptidesrated.com/about and do not factor into tier placement. Vendors that pay zero commission can and do land in Tier 1 if their data supports it.

What labs does the COA lookup tool index?

Three: Janoshik Analytical, Finnrick, and Freedom Diagnostics. These are the labs we have direct indexing agreements with. Other third-party labs (MZ Biolabs, Accumark, Ethos, MDx Bioanalytical) appear on individual supplier scorecards when vendors use them, but the searchable batch database is currently scoped to those three partners.

Why is the team anonymous?

Industry pressure. When you publish "Vendor X does not test third-party" or "Vendor Y is in the Not Recommended tier," their marketing teams respond. Anonymity lets the team write what the data supports without becoming a target. The tradeoff is that readers have to judge the work by the work, not by a named author's credentials. We think that is a fair tradeoff for an auditable-methodology site.

How often are supplier scorecards updated?

Scorecards refresh whenever new COAs publish, new Trustpilot reviews land, or a vendor changes a policy like payment rails or returns. We also re-audit the full vendor list quarterly to catch silent changes, like a vendor switching from third-party to in-house testing.

What does "Tier 1" actually require?

Named third-party lab with public batch-level COAs, Trustpilot rating above 4.5 with meaningful review volume, documented returns or guarantee policy, transparent pricing, and no active regulatory red flags. A vendor missing any of those drops to Tier 2 or lower depending on severity.

Sources

PeptidesRated COA Lookup tool: https://peptidesrated.com/coa

PeptidesRated methodology, rubric, and affiliate disclosure: https://peptidesrated.com/about

PeptidesRated vendor comparison table: https://peptidesrated.com/compare

Example supplier scorecard (Ascension Peptides): https://peptidesrated.com/supplier/ascension-peptides

Outliyr peptides category: https://outliyr.com/peptides

PeptideDeck: https://peptidedeck.com

16 CFR Part 255 (FTC Guides Concerning the Use of Endorsements and Testimonials in Advertising): https://www.ecfr.gov/current/title-16/chapter-I/subchapter-B/part-255