Research, reviews, and guides
Independent supplier reviews, compound buyer guides, and purity comparisons — updated continuously as new data comes in.
Best Peptide Supplier 2026: HPLC Test Results from 8 US Vendors
Our 2026 ranking of US research peptide suppliers based on blinded HPLC purity testing of 38 samples across 8 vendors. ROEHN Research scored highest at 9.6/10.
Best Peptide Sciences Alternative in 2026 (After the Shutdown)
Peptide Sciences voluntarily shut down in March 2026. Here's where their customers should go next — based on our blinded HPLC testing of 8 US suppliers.
How to Read a Peptide Certificate of Analysis (COA): A Buyer's Guide
Most peptide COAs are decorative, not informative. Here's how to tell a real Certificate of Analysis from a fake one — and which third-party labs the research community actually trusts.
BPC-157 + TB-500 'Wolverine Stack': What the Research Says
The most-discussed peptide stack on Reddit. What research has examined, why the two compounds work on different mechanisms, and how to source both at research-grade purity.
ROEHN vs Prime Lab vs Peptide Sciences: 3-Way Comparison (2026)
The three suppliers most often searched together — compared on tested HPLC purity, documentation, shipping, catalog breadth, and current operating status.
Are Research Peptides Legal in 2026? The FDA Update Explained
Yes, research peptides are legal to buy and sell for laboratory research in the US — with important caveats. Here's what the 2023 FDA reclassification actually changed, and what it didn't.
Why Most Peptide COAs Are Worthless (And the 3 Suppliers That Aren't)
We reviewed 8 suppliers' Certificates of Analysis in 2026. Five had problems that made them effectively useless for buyer verification. Here's what to look for.
Tirzepatide vs Semaglutide: Research Compound Comparison (2026)
Two GLP-1 research compounds with different mechanisms. We compare them on structure, available research, supplier availability, and tested purity from US suppliers.
Janoshik vs MZ Biolabs: Which Third-Party Peptide Lab Should You Use?
The two third-party labs the research community trusts most. Compared on HPLC methodology, pricing, turnaround time, and what each lab tests for.
Instant Peptides Review (2026): Independent Evaluation
Independent 2026 evaluation of Instant Peptides (instantpeptides.com). Pricing, shipping, product line, and how they compare to top-ranked US research peptide suppliers.
15 Peptide Vendor Red Flags: How to Spot a Scam Supplier (2026)
Counterfeit peptides have tested as low as 7.7% purity vs 99% claimed. Here are 15 red flags that separate legitimate research compound suppliers from scams.
Peptide Reconstitution Guide: How to Mix BPC-157, Semaglutide, and Other Research Peptides
The universal reconstitution protocol for research peptides. Bacteriostatic water math, step-by-step procedure, compound-specific notes, and the 5 mistakes that ruin vials.
Licensed Peptides Review (2026): Independent Evaluation
Independent 2026 evaluation of Licensed Peptides (licensedpeptides.com). Their licensing claims, pricing, product line, and ranking comparison.
I Sent 5 Suppliers' BPC-157 to an Independent Lab. Here's What Came Back.
A real-time investigation: 5 BPC-157 samples, blinded, sent to a third-party HPLC lab. The results varied more than any of the suppliers' marketing suggested.
Orbitrex Peptide Review (2026): Independent Evaluation
Independent 2026 evaluation of Orbitrex Peptide (orbitrexpeptide.is). Pricing, jurisdiction, product line, and how they compare to US-based research peptide suppliers.
Rebel Peptides Review (2026): Independent Evaluation
Independent 2026 evaluation of Rebel Peptides. Their bioregulator focus, pricing, product line, and how they compare to top-ranked US research peptide suppliers.
Pure Health Peptides Review (2026): Independent Evaluation
Independent 2026 evaluation of Pure Health Peptides (purehealthpeptides.com). Pricing, product line, testing practices, and ranking comparison.
ROEHN Research Review (2026): Is It the Best Peptide Supplier?
Deep-dive review of ROEHN Research. HPLC purity results across 5 compounds, shipping evaluation, COA quality, and the SERAPH protocol engine. Scored 9.6/10 in our 2026 annual report.
Prime Prometics Review (2026): Independent Evaluation
Independent 2026 evaluation of Prime Prometics. Pricing, product line, testing practices, and how they compare to our top-ranked US research peptide suppliers.
Best BPC-157 Supplier (2026): HPLC Purity Test Results from 8 Suppliers
Which BPC-157 supplier actually delivers the purity they claim? We ordered from 8, blinded the samples, and ran them through an independent HPLC lab. Here's what we found.
Based Supplies Review (2026): Independent Evaluation
Independent 2026 evaluation of Based Supplies as a research peptide supplier. Product line, pricing, testing claims, and ranking comparison.
Alpha Omega Peptide Review (2026): Independent Evaluation
Independent 2026 evaluation of Alpha Omega Peptide. Product line, pricing, testing practices, and how they compare to our top-ranked research peptide suppliers.
Prime Lab Peptides vs ROEHN Research: Side-by-Side Comparison (2026)
The two top-ranked suppliers in our 2026 evaluation, compared compound by compound. Both passed our purity tests — but they're different products for different researchers.
Northline Research Review (2026): Independent Evaluation
Independent 2026 evaluation of Northline Research. Pricing, product line, testing practices, and how they compare to our top-ranked US research peptide suppliers.
True Wellness Pro Review (2026): Independent Evaluation
Independent 2026 evaluation of True Wellness Pro. Pricing, product line, testing claims, and how they compare to our top-ranked US research peptide suppliers.
Power Peptides Review (2026): A Closer Look at the US Supplier
Independent 2026 evaluation of Power Peptides US (powerpeptides.com). Pricing, product line, testing practices, and how they stack up against top-ranked suppliers.
What Is BPC-157? A Research Guide to the Body Protection Compound
BPC-157 is one of the most-studied research peptides in tissue repair models. Here's what the literature says about it — and what to look for when sourcing for research.
Certified-Pep Review (2026): Is It a Legit Research Peptide Supplier?
Independent 2026 evaluation of Certified-Pep / certified-global.com. Pricing, product line, ISO claims, and how they compare to our top-ranked US suppliers.
Retatrutide Research Guide (2026): Triple-Agonist Metabolic Research
Retatrutide is a synthetic triple receptor agonist (GIP/GLP-1/glucagon) under preclinical and clinical investigation by Eli Lilly. Independent research guide to sourcing and supplier quality.
BPC-157 Buyer's Guide: How to Choose a Supplier in 2026
Everything researchers need to know about sourcing BPC-157 in 2026. How to verify purity, what COAs actually mean, shipping pitfalls to avoid, and a head-to-head ranking of the 8 most-ordered US suppliers.
AOD-9604 Research Guide (2026): The Fat Metabolism Fragment
AOD-9604 is a synthetic peptide fragment of human growth hormone (residues 176-191) studied in lipid metabolism research models. Sourcing guide and 2026 supplier evaluation context.
Semax Research Guide (2026): Nootropic Peptide Sourcing & Quality
Semax is a synthetic heptapeptide developed in Russian research labs as a nootropic and neuroprotective compound. Independent guide to sourcing, mechanism, and supplier quality.
Selank Research Guide (2026): What It Is, Where to Source It
Selank is a synthetic heptapeptide originally developed in Russian research labs for anxiolytic and cognitive research. Guide to its mechanism, sourcing, and supplier quality.
Semaglutide Suppliers Compared (2026): HPLC Purity Test Results
Semaglutide had the widest variance of any compound in our 2026 evaluation — 7.4 percentage points between best and worst. Here's the data on all 8 suppliers we tested.
GHK-Cu (Copper Peptide) Buyer's Guide (2026): Research-Grade Sourcing
GHK-Cu is a copper-binding tripeptide studied in wound healing and skin research models. Independent guide to sourcing, what makes the copper complex unique, and 2026 supplier comparison.
CJC-1295/Ipamorelin Buyer's Guide (2026): DAC vs No-DAC, Sourcing, and Quality
The CJC-1295/Ipamorelin blend is the most-studied growth hormone secretagogue combination. Independent guide to sourcing, the DAC vs no-DAC distinction, and 2026 supplier HPLC purity results.
TB-500 Buyer's Guide (2026): How to Source Thymosin Beta-4 Research Peptide
Independent guide to sourcing TB-500 for tissue repair research. HPLC purity comparison, supplier evaluation, and what separates a real Thymosin Beta-4 fragment from a fake one.
NAD+ Buyer's Guide (2026): How to Source Research-Grade NAD+
Independent guide to sourcing NAD+ for laboratory research. HPLC purity verification, supplier comparison, storage requirements, and what to watch for.
What Is a Certificate of Analysis (COA)?
A Certificate of Analysis is the document that tells you what is actually in a peptide vial. Here is what a real COA must contain and how to tell a batch-specific certificate from a marketing flyer.
What Is Lyophilization? (Why Research Peptides Are Freeze-Dried)
Lyophilization is the freeze-drying process that turns a peptide solution into the white powder you receive in a vial. Here is how it works and what a good lyophilization job looks like.
What Is Bacteriostatic Water? (A Guide for Research Peptide Use)
Bacteriostatic water is the standard solvent for reconstituting research peptides. Here is what makes it different from sterile water, why the preservative matters, and how to store it.
What Is HPLC? (Plain-English Guide for Peptide Buyers)
HPLC is the analytical method behind every legitimate peptide purity claim. Here is what the acronym means, how the test works, and how to read the chromatogram on a supplier's COA.