Top Custom Peptide Synthesis Providers

Companies that state they synthesise peptide sequences to order, compared for research and business buyers.

Independently evaluatedManufacturing disclosure reviewedSources and dates shownUpdated September 2026

How we score suppliers ·Advertiser disclosure

Advertiser disclosure: Peptide Ad Lab may have commercial relationships with companies on this page. Featured placements are labelled and are separate from the editorial ranking; they do not change any score or position. Details.

Editorial comparison

ranked by Peptide Ad Lab score · 7 ranked · 20 listed without a rank · September 2026
#1 · Highest editorial score

Koi Research Labs LLC

Best for Laboratories and research institutions

Location
Sheridan, Wyoming, USA
Testing
Third-party testedBatch COAsPublic COAsHPLC purityMass spec IDNamed testing labLot traceabilityWholesale docs
Wholesale
Yes · 50 vials minimum
9.4/10Peptide Ad Lab Score
79% evidence coverage Visit website View company profile
See how we scored them

Overview

The company states it operates as a chemical supplier offering research-grade peptides, custom synthesis, and bulk wholesale programs aimed at scientific researchers, academic laboratories, and biotech companies. According to the site, products are synthesized and lyophilized in the United States, targeting a purity level of 99% or higher. The platform publishes lot-specific Certificates of Analysis and analytical documentation, including HPLC purity and LC-MS identity confirmation, for its catalog items.

The supplier states that testing is conducted by an independent ISO/IEC 17025-accredited laboratory, with chromatograms and endotoxin testing results provided per batch. Purchasing is handled online or through wholesale application portals, featuring same-day fulfillment for orders placed before the daily cutoff. Buyers must inquire directly for custom quotes, specific volume pricing tiers, or unlisted synthesis modifications.

Score breakdown weighted for this page

Testing & Documentation 25%
10.0
Business Transparency 20%
10.0
Wholesale Capabilities 5%
10.0
Manufacturing Capabilities 30%
10.0
Commercial Purchasing 10%
10.0
Fulfillment & Logistics 7%
10.0
Website / Buyer Experience 3%
10.0

Rubric score 10.0 across the 79% of the rubric verified so far, adjusted for evidence coverage to a published score of 9.4. How this is calculated

Full methodology.

#2

Peptide Technologies

Best for Wholesale research peptide buyers

Location
United States
Testing
Third-party testedBatch COAsPublic COAsHPLC purityMass spec IDLot traceabilityWholesale docs
Wholesale
Yes · 100 mg minimum
9.1/10Peptide Ad Lab Score
70% evidence coverage Visit website View company profile
See how we scored them

Overview

The company operates as a US-based peptide manufacturer supplying bulk research peptides, custom synthesis, and white-label services exclusively to verified businesses. The site states that all offerings are aimed at qualified commercial buyers through a wholesale-only program requiring business verification. Additionally, the company publishes catalog listings, lot-level certificates of analysis, pricing tiers, and educational resources directly on its platform.

According to the supplier, every released lot undergoes a six-test analytical panel at an independent ISO 17025-accredited third-party laboratory, with results accessible via vial QR codes. The purchasing workflow involves business verification via Didit, an AI order assistant, invoicing on net terms, and cold-chain fulfillment on dry ice. However, buyers would still need to inquire about specific delivery schedules and shipping regions, as the site notes order shipments can take up to 60 or 180 days.

Score breakdown weighted for this page

Testing & Documentation 25%
10.0
Business Transparency 20%
Not assessed
Wholesale Capabilities 5%
10.0
Manufacturing Capabilities 30%
10.0
Commercial Purchasing 10%
10.0
Fulfillment & Logistics 7%
10.0
Website / Buyer Experience 3%
Not assessed

Rubric score 10.0 across the 70% of the rubric verified so far, adjusted for evidence coverage to a published score of 9.1. How this is calculated

Full methodology.

#3

PeptideTech

Best for Wholesale and private-label buyers

Location
United States
Testing
Third-party testedBatch COAsPublic COAsHPLC purityMass spec IDLot traceabilityWholesale docs
Wholesale
Yes · 100 mg minimum
9.0/10Peptide Ad Lab Score
68% evidence coverage Visit website View company profile
See how we scored them

Overview

The site states that Peptide Technologies operates as a US-based manufacturer supplying research peptides exclusively to verified businesses at a wholesale level. The company offers catalog stock, custom synthesis up to 60 residues, and private-label manufacturing services. Published materials include a public certificate of analysis library keyed to individual vial QR codes and pricing tiers based on order volume.

According to the company, every lot clears a six-test analytical panel at an independent ISO 17025-accredited laboratory before release, with documentation accessible via vial QR codes. The purchasing workflow requires business verification through Didit, after which orders are managed via a portal supporting net terms and ACH or wire payments. The site notes that order fulfillment can take up to 180 days, and buyers would still need to inquire about specific delivery timelines, exact compound availability, and international shipping capabilities.

Score breakdown weighted for this page

Testing & Documentation 25%
10.0
Business Transparency 20%
Not assessed
Wholesale Capabilities 5%
10.0
Manufacturing Capabilities 30%
10.0
Commercial Purchasing 10%
10.0
Fulfillment & Logistics 7%
Not assessed
Website / Buyer Experience 3%
10.0

Rubric score 10.0 across the 68% of the rubric verified so far, adjusted for evidence coverage to a published score of 9.0. How this is calculated

Full methodology.

#4

Kylo Peptides

Best for Research laboratories and volume buyers

Location
Sheridan, Wyoming, USA
Testing
Third-party testedBatch COAsPublic COAsHPLC purityMass spec IDNamed testing labLot traceabilityWholesale docs
Wholesale
Yes
9.0/10Peptide Ad Lab Score
67% evidence coverage Visit website View company profile
See how we scored them

Overview

The company states it is a US-based chemical and research peptide supplier serving scientific researchers, academic laboratories, and biotech or pharmaceutical companies. The site offers individual research peptides, peptide blends, peptide stacks, and laboratory supplies intended for preclinical and in vitro research. According to the company, products undergo synthesis and lyophilization in the United States, and the site publishes batch-specific Certificates of Analysis (COAs) in a public library.

The company states that every batch is tested for identity, purity, endotoxins, sterility, heavy metals, and net content by independent laboratories such as Freedom Diagnostics, Janoshik Analytical, and Vanguard Laboratory. Customers complete purchases through a secure online checkout or apply for a wholesale partner program offering tiered volume pricing and lot-locked supply. The site states that orders dispatch within 24 hours on business days, with free shipping available on orders over $150. Buyers would still need to inquire about specific international shipping destination policies and exact catalog minimum order requirements.

Score breakdown weighted for this page

Testing & Documentation 25%
10.0
Business Transparency 20%
10.0
Wholesale Capabilities 5%
10.0
Manufacturing Capabilities 30%
Not assessed
Commercial Purchasing 10%
10.0
Fulfillment & Logistics 7%
10.0
Website / Buyer Experience 3%
10.0

Rubric score 10.0 across the 67% of the rubric verified so far, adjusted for evidence coverage to a published score of 9.0. How this is calculated

Full methodology.

#5

NeuroPept Ltd

Best for Laboratories and biotech companies

Location
Rotterdam, Netherlands
Testing
Third-party testedBatch COAsPublic COAsHPLC purityMass spec IDNamed testing labLot traceability
Wholesale
Not confirmed
9.0/10Peptide Ad Lab Score
66% evidence coverage Visit website View company profile
See how we scored them

Overview

The company states it operates as a direct manufacturer supplying research peptides and custom synthesis services aimed at laboratories and biotech companies worldwide. The site publishes a product catalogue, facility standards including ISO 9001:2015 certification, and details on automated solid-phase peptide synthesis and HPLC purification workflows. Additionally, the website features batch-specific Certificates of Analysis issued by Freedom Diagnostics Testing.

According to the site, orders follow a four-stage workflow encompassing SPPS synthesis, HPLC purification, mass spectrometry verification, and vacuum lyophilisation before cold-chain worldwide shipping. The company states that Certificates of Analysis are provided with all orders and pre-shipment product verification photos are available upon request. However, public pricing and minimum order quantities are not stated on the site, requiring buyers to contact the team for quotes and specific purchasing terms.

Score breakdown weighted for this page

Testing & Documentation 25%
10.0
Business Transparency 20%
10.0
Wholesale Capabilities 5%
Not assessed
Manufacturing Capabilities 30%
10.0
Commercial Purchasing 10%
Not assessed
Fulfillment & Logistics 7%
10.0
Website / Buyer Experience 3%
10.0

Rubric score 10.0 across the 66% of the rubric verified so far, adjusted for evidence coverage to a published score of 9.0. How this is calculated

Full methodology.

#6

LIANTAO Peptide

Best for Laboratories, brands, and distributors

Location
China
Testing
Third-party testedBatch COAsPublic COAsHPLC purityMass spec IDLot traceability
Wholesale
Yes
8.9/10Peptide Ad Lab Score
63% evidence coverage Visit website View company profile
See how we scored them

Overview

LIANTAO Peptide operates as a peptide manufacturer founded in 2014, offering custom synthesis and catalog products produced via solid-phase peptide synthesis. The company targets brands, laboratories, formulators, and distributors across more than 40 countries. Its website publishes product catalogs spanning cosmetic, research, and nutritional peptides, alongside company history, regulatory compliance information, and blog articles on peptide analysis.

Every shipment includes documentation such as Certificates of Analysis (COAs), Material Safety Data Sheets (MSDS), and HPLC/mass spectrometry data upon request. The site lacks an online checkout system, requiring buyers to submit inquiries for personalized quotations, samples, lead times, and variable minimum order quantities. Orders are shipped internationally from China using express couriers with temperature-controlled packaging, while buyers remain responsible for local import duties and permits.

Score breakdown weighted for this page

Testing & Documentation 25%
10.0
Business Transparency 20%
Not assessed
Wholesale Capabilities 5%
10.0
Manufacturing Capabilities 30%
10.0
Commercial Purchasing 10%
Not assessed
Fulfillment & Logistics 7%
10.0
Website / Buyer Experience 3%
Not assessed

Rubric score 10.0 across the 63% of the rubric verified so far, adjusted for evidence coverage to a published score of 8.9. How this is calculated

Full methodology.

#7

Wholesale Research Peptides

Best for Research laboratories and institutions

Location
Queensland, Australia
Testing
Third-party testedBatch COAsPublic COAsHPLC purityMass spec IDNamed testing labLot traceabilityWholesale docs
Wholesale
Yes
8.8/10Peptide Ad Lab Score
62% evidence coverage Visit website View company profile
See how we scored them

Overview

The site states that Wholesale Research Peptides operates as a wholesale supplier providing lab-grade research materials exclusively to qualified laboratories, universities, and contract research organisations. The company publishes a product catalogue along with a public purity database containing third-party HPLC and mass spectrometry reports for released lots. According to the platform, all materials are intended strictly for in-vitro laboratory research rather than human or veterinary use.

The company states that orders are processed through a quote-and-invoice workflow using bank transfer or PayID, with no credit card payments accepted. Dispatched orders include batch-matched certificates of analysis, and the company maintains cold storage at −20 °C prior to worldwide shipping. Buyers must contact the supplier directly to determine specific compound pricing, item-specific minimum order quantities, and jurisdictional import requirements.

Score breakdown weighted for this page

Testing & Documentation 25%
10.0
Business Transparency 20%
10.0
Wholesale Capabilities 5%
10.0
Manufacturing Capabilities 30%
Not assessed
Commercial Purchasing 10%
10.0
Fulfillment & Logistics 7%
10.0
Website / Buyer Experience 3%
10.0

Rubric score 10.0 across the 62% of the rubric verified so far, adjusted for evidence coverage to a published score of 8.8. How this is calculated

Full methodology.

Only suppliers with enough verified evidence are given a rank. The featured placement does not affect scores or order. Suppliers below the evidence bar are listed further down, unranked.

How Koi Research Labs LLC compares

A quick side-by-side of the #1 position against the next suppliers on this page, using the same verified criteria we apply to every supplier. Full evidence and sources are on each company profile.

Koi Research Labs LLC vs Peptide Technologies

Koi Research Labs LLCPeptide Technologies
LocationSheridan, Wyoming, USAUnited States
Testing checks8 of 87 of 8
WholesaleYes · 50 vials minimumYes · 100 mg minimum
PAL score9.4/109.1/10
  • Both confirm third-party testing, batch COAs, public COAs and more.
  • Koi Research Labs LLC also confirms a named testing lab; not confirmed for Peptide Technologies.
  • Peptide Ad Lab score: 9.4 vs 9.1. Evidence coverage: 79% vs 70%.

Koi Research Labs LLC vs PeptideTech

Koi Research Labs LLCPeptideTech
LocationSheridan, Wyoming, USAUnited States
Testing checks8 of 87 of 8
WholesaleYes · 50 vials minimumYes · 100 mg minimum
PAL score9.4/109.0/10
  • Both confirm third-party testing, batch COAs, public COAs and more.
  • Koi Research Labs LLC also confirms a named testing lab; not confirmed for PeptideTech.
  • Peptide Ad Lab score: 9.4 vs 9.0. Evidence coverage: 79% vs 68%.

Koi Research Labs LLC vs Kylo Peptides

Koi Research Labs LLCKylo Peptides
LocationSheridan, Wyoming, USASheridan, Wyoming, USA
Testing checks8 of 88 of 8
WholesaleYes · 50 vials minimumYes
PAL score9.4/109.0/10
  • Same testing picture: both confirm all 8 of the testing checks we track.
  • Peptide Ad Lab score: 9.4 vs 9.0. Evidence coverage: 79% vs 67%.

Koi Research Labs LLC vs NeuroPept Ltd

Koi Research Labs LLCNeuroPept Ltd
LocationSheridan, Wyoming, USARotterdam, Netherlands
Testing checks8 of 87 of 8
WholesaleYes · 50 vials minimumNot confirmed
PAL score9.4/109.0/10
  • Both confirm third-party testing, batch COAs, public COAs and more.
  • Koi Research Labs LLC also confirms a wholesale documentation pack; not confirmed for NeuroPept Ltd.
  • Peptide Ad Lab score: 9.4 vs 9.0. Evidence coverage: 79% vs 66%.

Side-by-side comparison

Ordered by Peptide Ad Lab score.

#SupplierBased inCOAs / testingWholesaleScore
1 Koi Research Labs LLC Sheridan, Wyoming, USAYesYes 9.4 Profile
2 Peptide Technologies United StatesYesYes 9.1 Profile
3 PeptideTech United StatesYesYes 9.0 Profile
4 Kylo Peptides Sheridan, Wyoming, USAYesYes 9.0 Profile
5 NeuroPept Ltd Rotterdam, NetherlandsYesNot confirmed 9.0 Profile
6 LIANTAO Peptide ChinaYesYes 8.9 Profile
7 Wholesale Research Peptides Queensland, AustraliaYesYes 8.8 Profile

Listed, not ranked

These companies match this page but have not published enough verifiable information for us to rank them. We list what we could verify and do not estimate the rest.

Peptide Xplorations

Peptide Xplorations manufactures bulk and wholesale research peptides for laboratories and businesses in the United States.

Location
Scottsdale, Arizona, USA
Testing
Batch COAsMass spec IDLot traceabilityWholesale docs
Wholesale
Yes · Minimum order published
Insufficient evidence to rank 64% evidence coverage
  • Testing & Documentation 50% verified (needs 60%)
View company profileVisit website

Trusty Peptide

Trusty Peptide supplies research-grade lyophilized peptides tested for minimum 98 percent purity with certificates of analysis.

Location
Texas, USA
Testing
Third-party testedBatch COAsPublic COAsHPLC purityMass spec IDLot traceability
Wholesale
Yes
Insufficient evidence to rank 57% evidence coverage
  • overall evidence coverage 57% (needs 60%)
View company profileVisit website

Peptides Bio

Peptides Bio supplies lyophilized peptide compounds for in-vitro laboratory research and academic study applications.

Location
Unit 707, 7/F, Building 19W, Phase 3, Hong Kong Science Park, 19 Science Park West Avenue, Sha Tin, New Territories, Hong Kong
Testing
Batch COAsMass spec IDLot traceability
Wholesale
Not confirmed
Insufficient evidence to rank 54% evidence coverage
  • overall evidence coverage 54% (needs 60%)
  • Testing & Documentation 39% verified (needs 60%)
View company profileVisit website

Peptidesr4u

The company supplies synthetic research peptides and custom synthesis services for scientific research.

Location
England and Wales, UK
Testing
Batch COAsMass spec ID
Wholesale
Yes · No minimum
Insufficient evidence to rank 47% evidence coverage
  • overall evidence coverage 47% (needs 60%)
  • Testing & Documentation 28% verified (needs 60%)
View company profileVisit website

Bulk RUO Peptides

Bulk RUO Peptides supplies research-use-only peptides in wholesale kits and bulk quantities to verified businesses.

Location
United States
Testing
Batch COAsMass spec IDLot traceabilityWholesale docs
Wholesale
Yes · $1,500 minimum order
Insufficient evidence to rank 46% evidence coverage
  • overall evidence coverage 46% (needs 60%)
  • Testing & Documentation 50% verified (needs 60%)
View company profileVisit website

Schafer-N ApS

Schafer-N provides custom peptide synthesis and high-density peptide microarray services for researchers.

Location
Copenhagen, Denmark
Testing
Batch COAsMass spec ID
Wholesale
Not confirmed
Insufficient evidence to rank 46% evidence coverage
  • overall evidence coverage 46% (needs 60%)
  • Testing & Documentation 28% verified (needs 60%)
View company profileVisit website

Stablize Peptides

Stablize Peptides offers research formats, bulk raw materials, and custom synthesis services for B2B procurement.

Location
China
Testing
Batch COAsNamed testing labLot traceabilityWholesale docs
Wholesale
Yes · 10 vials minimum
Insufficient evidence to rank 45% evidence coverage
  • overall evidence coverage 45% (needs 60%)
  • Testing & Documentation 50% verified (needs 60%)
View company profileVisit website

BIOSYNTAN GmbH

Biosyntan provides custom peptide synthesis, modified peptides, and analytical services for research applications.

Location
Berlin, Germany
Testing
Mass spec ID
Wholesale
Not confirmed
Insufficient evidence to rank 45% evidence coverage
  • overall evidence coverage 45% (needs 60%)
  • Testing & Documentation 11% verified (needs 60%)
View company profileVisit website

Atlas BioLabs

Atlas BioLabs supplies wholesale and custom peptides sourced from manufacturing partners in China.

Location
Union City, California, USA
Testing
Batch COAsLot traceabilityWholesale docs
Wholesale
Yes · 10 units minimum
Insufficient evidence to rank 43% evidence coverage
  • overall evidence coverage 43% (needs 60%)
  • Testing & Documentation 50% verified (needs 60%)
View company profileVisit website

Atura Research

Atura Research supplies wholesale research peptides and custom synthesis services for U.S. laboratories and formulators.

Location
United States
Testing
Batch COAsMass spec IDLot traceabilityWholesale docs
Wholesale
Yes · 1 gram minimum
Insufficient evidence to rank 41% evidence coverage
  • overall evidence coverage 41% (needs 60%)
  • Testing & Documentation 50% verified (needs 60%)
View company profileVisit website

Peptivara Hong Kong Ltd.

Peptivara manufactures and supplies catalog and custom pharmaceutical-grade peptides for research and biotech applications globally.

Location
Kowloon, Hong Kong
Testing
Batch COAsMass spec IDLot traceability
Wholesale
Not confirmed
Insufficient evidence to rank 41% evidence coverage
  • overall evidence coverage 41% (needs 60%)
  • Testing & Documentation 39% verified (needs 60%)
View company profileVisit website

AAPPTec

AAPPTec provides peptide synthesis reagents, automated synthesizers, and custom peptide manufacturing services for research and industrial production.

Location
Louisville, Kentucky, USA
Testing
Mass spec ID
Wholesale
Not confirmed
Insufficient evidence to rank 37% evidence coverage
  • overall evidence coverage 37% (needs 60%)
  • Testing & Documentation 11% verified (needs 60%)
View company profileVisit website

Peptide 2.0 Inc.

Peptide 2.0 offers custom peptide synthesis, library generation, and high-throughput production services for researchers.

Location
Not stated
Testing
Batch COAsHPLC purityMass spec ID
Wholesale
Not confirmed
Insufficient evidence to rank 36% evidence coverage
  • overall evidence coverage 36% (needs 60%)
  • Testing & Documentation 39% verified (needs 60%)
View company profileVisit website

CASLO ApS

CASLO provides custom synthetic peptides and modification services utilizing Fmoc solid-phase synthesis for the research community.

Location
Kongens Lyngby, Denmark
Testing
Batch COAsMass spec ID
Wholesale
Not confirmed
Insufficient evidence to rank 35% evidence coverage
  • overall evidence coverage 35% (needs 60%)
  • Testing & Documentation 28% verified (needs 60%)
View company profileVisit website

Aurchain Biotech

Aurchain Biotech supplies peptide raw materials, research peptides, cosmetic peptide ingredients, and custom synthesis services.

Location
Guangzhou, China
Testing
Batch COAsLot traceabilityWholesale docs
Wholesale
Yes
Insufficient evidence to rank 34% evidence coverage
  • overall evidence coverage 34% (needs 60%)
  • Testing & Documentation 50% verified (needs 60%)
View company profileVisit website

Bulk Peptides Company

The company supplies wholesale research-grade peptides in bulk kits with batch-specific certificates of analysis.

Location
Southern California, USA
Testing
Batch COAsMass spec IDLot traceabilityWholesale docs
Wholesale
Yes · Minimum order published
Insufficient evidence to rank 32% evidence coverage
  • overall evidence coverage 32% (needs 60%)
  • Testing & Documentation 50% verified (needs 60%)
View company profileVisit website

SunGlobal Peptides

SunGlobal Peptides supplies wholesale research peptides to verified B2B distributors, compounding pharmacies, and research institutions.

Location
Not stated
Testing
Batch COAsLot traceability
Wholesale
Yes · Minimum order published
Insufficient evidence to rank 28% evidence coverage
  • overall evidence coverage 28% (needs 60%)
  • Testing & Documentation 28% verified (needs 60%)
View company profileVisit website

AurexonBio

AurexonBio supplies peptide raw materials, custom synthesis solutions, and OEM packaging for business buyers worldwide.

Location
Not stated
Testing
Batch COAsMass spec IDWholesale docs
Wholesale
Yes
Insufficient evidence to rank 28% evidence coverage
  • overall evidence coverage 28% (needs 60%)
  • Testing & Documentation 39% verified (needs 60%)
View company profileVisit website

NovaChain Bio

NovaChain Bio supplies cosmetic peptides, research materials, and custom synthesis services for B2B buyers.

Location
Not stated
Testing
Third-party testedBatch COAsLot traceabilityWholesale docs
Wholesale
Yes
Insufficient evidence to rank 27% evidence coverage
  • overall evidence coverage 27% (needs 60%)
View company profileVisit website

US2UPEP

The company provides bulk research peptides and custom OEM manufacturing with direct wholesale pricing and batch testing.

Location
Not stated
Testing
Batch COAsMass spec IDLot traceability
Wholesale
Yes
Insufficient evidence to rank 27% evidence coverage
  • overall evidence coverage 27% (needs 60%)
  • Testing & Documentation 39% verified (needs 60%)
View company profileVisit website

Methodology

How Peptide Ad Lab Evaluates Suppliers

Every supplier is scored on the same seven dimensions, and the overall score is calculated from those dimensions — it is never assigned by hand. Where a supplier has not published something, we record it as not confirmed: an information gap is excluded from the calculation rather than scored as a zero, and we never infer a capability a company has not stated.

Scoring weights on this page

Testing & Documentation
25%
Business Transparency
20%
Wholesale Capabilities
5%
Manufacturing Capabilities
30%
Commercial Purchasing
10%
Fulfillment & Logistics
7%
Website / Buyer Experience
3%

Manufacturing capability is weighted up on this page because it is what a custom-synthesis buyer is choosing on.

What we look at

Business transparencyCompany information, contact routes and operating detail that a commercial buyer can verify.
Testing / COA availabilityWhether certificates of analysis are published, provided on request, and tied to specific lots.
Wholesale capabilitiesExistence and clarity of a wholesale or bulk program, pricing tiers and account approval.
Manufacturing capabilitiesIn-house synthesis versus distribution, and what is documented about production.
Custom synthesisWhether made-to-order sequences are offered, and what the quoting process looks like.
Private-label availabilityPackaging and labelling programs, and the documented onboarding process.
Geographic fulfillmentWhere the supplier ships from and to, and any stated regional restrictions.
Website / business qualityClarity, completeness and consistency of published commercial information.
Jurisdictions and registrationWhether the supplier states where it operates or ships, and whether its business registration can be verified in a public registry.
Commercial purchasing optionsQuotes, purchase orders, account creation and repeat-order support for business buyers.
View Our Ranking Methodology

Frequently Asked Questions

How does Peptide Ad Lab evaluate suppliers?

Each supplier is assessed against a published set of criteria covering business transparency, testing and documentation, wholesale capabilities, manufacturing capabilities, website experience, commercial purchasing and fulfillment. Assessments use publicly available information: the company's own website, published documentation, and publicly stated programs. Where something cannot be confirmed, it is shown as not confirmed rather than counted against the supplier.

Can suppliers pay to be included?

Suppliers can purchase sponsored visibility, such as a featured placement on a comparison page or a sponsored position on a comparison page. Those placements are always clearly labelled as sponsored. Payment does not create, change or influence a Peptide Ad Lab editorial score. Where a comparison page includes a sponsored position, it carries a visible "Sponsored placement" label, and every other position on the page follows editorial score order.

What is custom peptide synthesis?

Custom synthesis is the production of a specific peptide sequence to order, rather than from a catalogue. Buyers typically supply the sequence and required purity, and the supplier quotes on scale, purity grade, modifications and lead time. Analytical documentation such as HPLC and mass spectrometry data is normally part of the deliverable.

More supplier comparisons

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