Buying guide
Best Peptide Vendors November 2026
Ranked on what each vendor can prove: the third-party certificates it publishes, the laboratory that signed them, and the gap between the mass on the label and the mass in the vial.
57 vendors scored · 664 certificate records read · last updated 5 Nov 2026
The top-rated research peptide vendor is Origin Labs, scoring 89.1 of 100 on 25 third-party certificates of analysis from ILS Laboratories. Below are the 10 highest-scoring vendors of 57 indexed, ranked by one published rubric over 664 lot-level certificate records, by an independent index of research-peptide vendors where no vendor can pay for a rank. Every figure links to the document behind it.
The top three
visit, with the code where we hold one- 1
Origin LabsILS Laboratories · 25 certificates89.1of 100Extensively documentedVisit Origin Labs - 2
Next Gen PeptidesILS Laboratories · 114 certificates87.7of 100Extensively documentedVisit Next Gen Peptides - 3
ZC LabsILS Laboratories · 39 certificates87.2of 100Extensively documentedVisit ZC Labs
Why trust this ranking
- PepIndex does not sell peptides. It has no product, no stock and no house brand.
- Scores come from a rubric published in full and are recomputable from the open dataset. Every data point carries its source URL and the date it was checked.
- Some outbound links are partner links and are marked as such. Partner status cannot reach the scoring function; the code will not compile if it is passed. How this is funded.
- 27 of 57 vendors publish a certificate this index could read, and 10 name a laboratory with recorded ISO/IEC 17025 accreditation. Both figures are lower than the marketing in this market implies.
Quick picks
Best overall
89.1of 100Extensively documentedHighest score in the index at 89.1 of 100, on 25 certificates.
Visit Origin LabsBest value
87.2of 100Extensively documentedCheapest basket of any priced vendor, at 42% of the peer median.
Visit ZC LabsMost certificates
87.7of 100Extensively documented114 lot-level certificates on file, the largest published set in the index.
Visit Next Gen PeptidesBest for GLP-1 compounds
87.7of 100Extensively documentedThe highest-ranked vendor that both publishes certificates for and prices retatrutide, tirzepatide or semaglutide.
Visit Next Gen Peptides
Why each vendor ranks where it does
- Testing laboratory
- ILS LaboratoriesISO 17025
- Certificates
- 25 across 20 compounds
- Ships from
- US
- COA access
- public
Payment: Credit/debit card, Venmo, Cash App, Zelle, Cryptocurrency
Origin Labs ranks 1 of the index on 89.1 of 100, computed from 96% data coverage. 25 lot-level certificates are on file, issued by ILS Laboratories, and the assayed mass sits a mean 16.6% from the label. The testing laboratory holds ISO/IEC 17025 accreditation. Its basket prices at 57% of the peer median, so below the market. 20 tracked compounds are carried. The clearest gap on the record: no independent third-party reviews located.
- 25 lot-level certificates read and recorded here
- Certificates are readable publicly, without an account
- Testing laboratory named on certificates (ILS Laboratories)
- Testing laboratory holds ISO/IEC 17025 accreditation
- Testing laboratory
- ILS LaboratoriesISO 17025
- Certificates
- 114 across 29 compounds
- Ships from
- US
- COA access
- public
Payment: Visa, Discover
Next Gen Peptides ranks 2 of the index on 87.7 of 100, computed from 92% data coverage. 114 lot-level certificates are on file, issued by ILS Laboratories, and the assayed mass sits a mean 4.5% from the label. The testing laboratory holds ISO/IEC 17025 accreditation. Its basket prices at 60% of the peer median, so below the market. 29 tracked compounds are carried. The clearest gap on the record: no physical postal address is published.
- Publishes 179 certificates on its own site; 114 read and recorded here
- Certificates are readable publicly, without an account
- Testing laboratory named on certificates (ILS Laboratories)
- Testing laboratory holds ISO/IEC 17025 accreditation
- Testing laboratory
- ILS LaboratoriesISO 17025
- Certificates
- 39 across 19 compounds
- Ships from
- US
- COA access
- age gated
ZC Labs ranks 3 of the index on 87.2 of 100, computed from 93% data coverage. 39 lot-level certificates are on file, issued by ILS Laboratories, and the assayed mass sits a mean 9.1% from the label. The testing laboratory holds ISO/IEC 17025 accreditation. Its basket prices at 42% of the peer median, so below the market. 19 tracked compounds are carried. The clearest gap on the record: certificates are gated rather than openly readable.
- Publishes 44 certificates on its own site; 39 read and recorded here
- Testing laboratory named on certificates (ILS Laboratories)
- Testing laboratory holds ISO/IEC 17025 accreditation
- Operates under a named legal entity (ZC Labs LLC)
- Testing laboratory
- ILS LaboratoriesISO 17025
- Certificates
- 23 across 33 compounds
- Ships from
- US
- COA access
- age gated
Payment: Visa, Apple Pay, Google Pay, American Express
Amino Club ranks 4 of the index on 86.1 of 100, computed from 95% data coverage. 23 lot-level certificates are on file, issued by ILS Laboratories, and the assayed mass sits a mean 8.3% from the label. The testing laboratory holds ISO/IEC 17025 accreditation. Its basket prices at 75% of the peer median, so below the market. 33 tracked compounds are carried. The clearest gap on the record: certificates are gated rather than openly readable.
- 23 lot-level certificates read and recorded here
- Testing laboratory named on certificates (ILS Laboratories)
- Testing laboratory holds ISO/IEC 17025 accreditation
- Operates under a named legal entity (Prescribing Information Theratechnologies Inc.)
- Testing laboratory
- Freedom Diagnostics Testing
- Certificates
- 70 across 35 compounds
- Ships from
- US
- COA access
- public
Payment: Zelle, PayPal
PeptidePlugs ranks 5 of the index on 82.6 of 100, computed from 90% data coverage. 70 lot-level certificates are on file, issued by Freedom Diagnostics Testing, and the assayed mass sits a mean 10.5% from the label. No accreditation is recorded for the testing laboratory. Its basket prices at 83% of the peer median, so below the market. 35 tracked compounds are carried. The clearest gap on the record: no iso/iec 17025 accreditation recorded for the testing lab.
- Publishes 108 certificates on its own site; 70 read and recorded here
- Certificates are readable publicly, without an account
- Testing laboratory named on certificates (FreedomDiagnostics)
- Operates under a named legal entity (Austin Research Products LLC)
- Testing laboratory
- Vanguard LaboratoryISO 17025
- Certificates
- 30 across 38 compounds
- Ships from
- US
- COA access
- account required
Payment: Visa, Mastercard, Discover, Bitcoin
Modern Aminos ranks 6 of the index on 79.7 of 100, computed from 95% data coverage. 30 lot-level certificates are on file, issued by Vanguard Laboratory, and the assayed mass sits a mean 12.3% from the label. The testing laboratory holds ISO/IEC 17025 accreditation. Its basket prices at 99% of the peer median, so below the market. 38 tracked compounds are carried. The clearest gap on the record: certificates are gated rather than openly readable.
- Publishes 154 certificates on its own site; 30 read and recorded here
- Testing laboratory named on certificates (Vanguard Laboratory)
- Testing laboratory holds ISO/IEC 17025 accreditation
- Operates under a named legal entity (M.A. LLC)
- Testing laboratory
- AV Analytics
- Certificates
- 53 across 37 compounds
- Ships from
- US
- COA access
- public
Payment: Bank transfer, Zelle, PayPal
Bench Grade Peptides ranks 7 of the index on 79.4 of 100, computed from 87% data coverage. 53 lot-level certificates are on file, issued by AV Analytics, and the assayed mass sits a mean 6.8% from the label. No accreditation is recorded for the testing laboratory. Its basket prices at 100% of the peer median, so above the market. 37 tracked compounds are carried. The clearest gap on the record: no iso/iec 17025 accreditation recorded for the testing lab.
- Publishes 133 certificates on its own site; 53 read and recorded here
- Certificates are readable publicly, without an account
- Testing laboratory named on certificates (AV Analytics)
- Operates under a named legal entity (Bench Grade Peptides LLC)
- Testing laboratory
- ILS LaboratoriesISO 17025
- Certificates
- 32 across 24 compounds
- Ships from
- US
- COA access
- public
Payment: Visa, Mastercard, American Express, Discover
Hydro Research Peptides ranks 8 of the index on 78.7 of 100, computed from 85% data coverage. 32 lot-level certificates are on file, issued by ILS Laboratories, and the assayed mass sits a mean 10.8% from the label. The testing laboratory holds ISO/IEC 17025 accreditation. Its basket prices at 73% of the peer median, so below the market. 24 tracked compounds are carried. The clearest gap on the record: no registered legal entity is disclosed.
- Publishes 160 certificates on its own site; 32 read and recorded here
- Certificates are readable publicly, without an account
- Testing laboratory named on certificates (ILS Laboratories)
- Testing laboratory holds ISO/IEC 17025 accreditation
- Testing laboratory
- Bioviridian Inc.
- Certificates
- 10 across 10 compounds
- Ships from
- United States
- COA access
- public
Payment: Zelle, Venmo, Cash App, Bank transfer (ACH), USDC on Base
Stealth Research Labs ranks 9 of the index on 78.1 of 100, computed from 87% data coverage. 10 lot-level certificates are on file, issued by Bioviridian Inc., and the assayed mass sits a mean 2.8% from the label. No accreditation is recorded for the testing laboratory. Its basket prices at 100% of the peer median, so below the market. 10 tracked compounds are carried. The clearest gap on the record: no iso/iec 17025 accreditation recorded for the testing lab.
- Publishes 14 certificates on its own site; 10 read and recorded here
- Certificates are readable publicly, without an account
- Testing laboratory named on certificates (Bioviridian Inc.)
- Operates under a named legal entity (Stealth Research Labs LLC)
- Testing laboratory
- United Laboratories
- Certificates
- 27 across 26 compounds
- Ships from
- US
- COA access
- public
Payment: Visa, Mastercard, American Express, Discover, Apple Pay
One Aminos ranks 10 of the index on 78 of 100, computed from 85% data coverage. 27 lot-level certificates are on file, issued by United Laboratories, and the assayed mass sits a mean 7.3% from the label. No accreditation is recorded for the testing laboratory. Its basket prices at 96% of the peer median, so below the market. 26 tracked compounds are carried. The clearest gap on the record: no iso/iec 17025 accreditation recorded for the testing lab.
- Publishes 33 certificates on its own site; 27 read and recorded here
- Certificates are readable publicly, without an account
- Testing laboratory named on certificates (United Laboratories)
- Publishes a physical postal address
The top 10, compared
| # | Vendor | Score | Testing laboratory | COAs | ISO 17025 | BPC-157 $/mg |
|---|---|---|---|---|---|---|
| 1 | Origin Labs | 89.1 Extensively documented | ILS Laboratories | 25 | Yes | $2.50 |
| 2 | Next Gen Peptides | 87.7 Extensively documented | ILS Laboratories | 114 | Yes | $3.00 |
| 3 | ZC Labs | 87.2 Extensively documented | ILS Laboratories | 39 | Yes | $2.00 |
| 4 | Amino Club | 86.1 Extensively documented | ILS Laboratories | 23 | Yes | $4.00 |
| 5 | PeptidePlugs | 82.6 Well documented | Freedom Diagnostics Testing | 70 | Not recorded | $3.00 |
| 6 | Modern Aminos | 79.7 Well documented | Vanguard Laboratory | 30 | Yes | $6.80 |
| 7 | Bench Grade Peptides | 79.4 Well documented | AV Analytics | 53 | Not recorded | $3.90 |
| 8 | Hydro Research Peptides | 78.7 Well documented | ILS Laboratories | 32 | Yes | $4.00 |
| 9 | Stealth Research Labs | 78.1 Well documented | Bioviridian Inc. | 10 | Not recorded | $5.00 |
| 10 | One Aminos | 78 Well documented | United Laboratories | 27 | Not recorded | $5.00 |
The full board of 57 vendors, with filters, is on the vendor rankings page, and every captured price is on the price index.
Withdrawn from the index
Vendors removed from the board after they were listed, for going dark, withdrawing their documentation or failing a re-check. They are named here because a buying guide that only lists the living is not a record.
- Elytra Labs3 Aug 2026
- Purex Peptides3 Aug 2026
- SKO Compounds3 Aug 2026
- Penguin Peptides1 Aug 2026
- PureRawz1 Aug 2026
- RCS Research1 Aug 2026
- Skye Peptides1 Aug 2026
- Umbrella Labs1 Aug 2026
- Verified Peptides1 Aug 2026
Questions
- What are the best peptide vendors in 2026?
- 1. Origin Labs, 89.1 of 100 on 25 third-party certificates from ILS Laboratories; 2. Next Gen Peptides, 87.7 of 100 on 114 third-party certificates from ILS Laboratories; 3. ZC Labs, 87.2 of 100 on 39 third-party certificates from ILS Laboratories; 4. Amino Club, 86.1 of 100 on 23 third-party certificates from ILS Laboratories; 5. PeptidePlugs, 82.6 of 100 on 70 third-party certificates from Freedom Diagnostics Testing. Each is scored on the same published rubric over sourced facts: the certificates it publishes, the laboratory that signed them, the gap between labeled and assayed mass, price against the peer median, and business transparency. No vendor can pay to move.
- How can I tell if a peptide vendor is legitimate?
- Ask for the certificate of the exact lot you were shipped, and check three things on it: a named third-party laboratory that is not the vendor, an assayed mass printed against the label claim rather than purity alone, and a lot number that matches the vial. A purity percentage with no laboratory, no lot and no mass is not evidence. Of the 57 vendors indexed here, 27 publish a certificate this index could read.
- Which peptide suppliers’ lab reports can I verify myself?
- The ones whose certificates were signed by a laboratory that runs its own public lookup, because that lets you pull the report from the laboratory instead of trusting the vendor’s copy. Freedom Diagnostics prints a Search Code on every report and Janoshik prints a task number and access key; both resolve on the laboratory’s own site. Every certificate behind these rankings has its own page here listing the lot, the laboratory and the document.
- Are more expensive peptide vendors worth it?
- Price is a poor predictor of documentation quality. Across the vendors we hold both a price index and a score for, the correlation between the two is close to zero: the cheapest vendors are not the worst documented, and paying above the market median does not reliably buy better paperwork. What separates vendors is whether they publish checkable third-party certificates, which is not something price tells you.
- How should I compare peptide prices between vendors?
- Per milligram, never per vial. A $20 five-milligram vial is dearer than a $32 ten-milligram one, so vial pricing makes the smaller package look cheaper. Every price in this index is normalised to dollars per milligram at a reference vial size, then expressed against the median across every vendor selling the same compound, so a vendor is compared with its peers rather than across a catalogue mix.
- What does ISO/IEC 17025 accreditation mean on a peptide COA?
- ISO/IEC 17025 is an accreditation of the testing laboratory's competence for a stated scope, granted by a recognised body. It says the laboratory has been audited; it does not say the vial is good. Most peptide testing laboratories are not accredited: 10 of the 57 vendors here name a laboratory with recorded accreditation.
- Are these rankings affiliate-driven?
- No. Some outbound links are partner links and are marked as such. Partner status is structurally excluded from the scoring code: the function that computes a score cannot receive the affiliate field, so a commercial arrangement cannot move a rank even by accident.
Latest data report · 26 Oct 2026
Verifying a COA with the laboratory: who publishes a checkable report
Most indexed certificates are served by the vendor, not by the laboratory that signed them. Which laboratories publish a lookup, which of those lookups a machine can actually check, and why hosting decides whether evidence survives scrutiny.
Read the Verifying a COA with the lab →Last updated 5 Nov 2026, the most recent re-verification in the index. This page is generated from the live record, so the table and the writeups change when the data does and not on a schedule. Research use only: PepIndex publishes no dosing information and no protocols.