Vendor reviews
Independent peptide vendor reviews
Every vendor here is scored on the same five-part rubric, and the order of this list is the composite score, with no override of any kind. A score is not for sale, a position in this list is not for sale, and some of the outbound links on this site earn us a commission, which is set out in full in our disclosure. The numbers come from certificates, not from arrangements.
What changed this cycle
Every row dated, with the evidence behind it
Three different things are listed here, and they are kept apart because they are not the same thing. The rubric moved to v2, which re-anchors the midpoint at 3.0 and reserves the top band for evidence we have handled ourselves, so every vendor was restated against the same new scale on the same day. That is a scale change and nobody gained or lost ground from it. A vendor that moved on evidence is a real gain or loss. And a correction is neither: it means we were wrong and the vendor did not change. Corrections are listed first, including the one that cost our own commercial partner the top certificate score on this board.
We were wrong, and the vendor did not change. Certificate transparency was scored 4.4 on 28 August on the strength of a sample: we opened certificates, they all resolved, and we wrote that every catalog SKU was covered. On 29 August we counted the library instead of sampling it. It holds 17 published certificates against 38 catalog listings, and all 17 open. That is partial published coverage, not full, and 4.4 was the top score on this board for exactly the thing Axiom does not yet do. Corrected to 4.0, which drops the composite to 3.9. Axiom is a commercial partner of this site's owner, disclosed on every page it appears on, so an error in its favour is the one we are least entitled to leave standing. The count is reproducible at https://axiomlabz.us/coa-library/ and the catalog at https://axiomlabz.us/wp-sitemap-posts-product-1.xml.
We were wrong, and the vendor did not change. Orbitrex was listed on 28 August at certificate transparency 4.0 and marked COA-unverified, because at that point we had read its documentation policy rather than counted what it publishes. On 29 August we counted: 170 lot-dated certificate pages against 64 catalog listings, and 30 of 30 opened at random resolved. That is the widest published coverage of any vendor on this board and it is verified rather than asserted, so the COA-unverified flag was factually wrong and certificate transparency is corrected 4.0 to 4.4. Composite moves 3.7 to 3.8. The entry stays provisional: published coverage is not the same as material we have assayed, and the analytical dimension does not move. Recount at https://orbitrexpeptide.is/coas/.
New listing, scored on rubric v2. Enters well above the mid-tier because the certificate travels with the shipment and reports content per vial, which is the right default and still not the common one. Support scores materially below its documentation because a final-sale policy with a 48-hour damage window leaves a buyer with no recourse on a bad lot, and that single policy is what separates this entry from the one above it.
Restated on rubric v2 alongside every other vendor on the board. Scale change only. The reservation is unchanged: the documentation posture is genuinely strong, and v2 reserves the top band for lot coverage we have confirmed ourselves rather than for a posture we have read about.
Restated on rubric v2 alongside every other vendor on the board. Scale change only, no reassessment of the vendor at this step.
Restated on rubric v2 alongside every other vendor on the board. Scale change only: nothing about this vendor was reassessed at this step, and the position relative to its neighbours is unchanged.
Restated on rubric v2 alongside every other vendor on the board. Scale change only, no reassessment of the vendor at this step.
Restated on rubric v2 alongside every other vendor on the board. Scale change only, no reassessment of the vendor at this step.
Restated on rubric v2 alongside every other vendor on the board. Scale change only. v2 is harder on a storefront that presents well while its certificate practice stays thin, because that combination is the one a buyer is most likely to misread.
Restated on rubric v2 alongside every other vendor on the board. Scale change only, no reassessment of the vendor at this step.
Axiom Labz
Third-party COA on every batch, US-based fulfillment.
Orbitrex Peptides
Named third-party labs, QR-linked certificates per vial.
Synthesis Peptides
Certificate in every shipment, same-day dispatch, final sale.
Limitless Life Nootropics
Documentation-forward, premium pricing.
Peptide Pros
US vendor, straightforward catalog, verify documentation.
Amino Asylum
Broad catalog, aggressive pricing, uneven documentation.
Behemoth Labz
Wide catalog including blends, verify per lot.
Swiss Chems
Established name, tablet/capsule formats, mixed reviews.
Core Peptides
Clean storefront, US shipping, thin documentation.
Pure Rawz
Broad research-chemical catalog, uneven quality signals.
How we score
Each vendor gets a 0 to 5 rating in five dimensions, and the composite is their mean. The rubric is deliberately weighted toward the things that are hard to fake and expensive to do right.
Rubric v2, in force from 28 August 2026, fixes what the scale means so the same number means the same thing next year. 3.0 is the midpoint and describes a working vendor with partial documentation. Above 4.0 requires certificates that reconcile to the lot in hand. Above 4.5 requires material we have handled ourselves, which is why a vendor scored from published certificates alone is capped below it however good those certificates look. That ceiling is the reason most of this board sits in the threes, and it leaves room to record a vendor getting better instead of running out of scale.
- Analytical purity
- What HPLC and mass-spec results actually show, batch over batch, rather than the number printed on the storefront.
- COA transparency
- Whether a third-party certificate exists and reconciles to the specific lot you receive.
- Handling and packaging
- Whether temperature-sensitive material is packed for the trip, and what happens when a shipment arrives damaged.
- Support and disputes
- Responsiveness, and how they handle a bad lot or a package that never arrives.
- Value for purity
- Price measured against verified quality. Cheap material that fails identity scores worse than fair-priced clean material.
That is the summary. The full rubric sets out what each band means, what we refuse to let count, and why a score that moves has to carry a date and a reason.
What makes a vendor review worth reading
- No stated rubric, so nothing can be checked
- Star ratings with no analytical data behind them
- Commercial relationships left unstated
- The list reshuffles and the reasons never change
- One rubric, published, applied to every vendor
- Certificate verification is a scored dimension
- Ranked on the composite alone, with no commercial override
- Every score movement dated, with the evidence that moved it
- Rubric changes stated, and separated from vendor movements
- Active safety alerts tracked per vendor
Each vendor page carries community reviews, which are first-hand purchase stories you can open, read in full, and comment on. Reports labeled “from public discussion” are aggregated from public forum sentiment. You can also submit your own experience, which we moderate before it publishes. None of it is a substitute for reading the certificate yourself.