Read the paperwork before you trust the vendor.
coaindex is a plain-language reference for research peptides: how to read a certificate of analysis, how to tell a real third-party lab test from a fake, what happens when a source shuts down, and how common blends are actually put together. Research use only.
toolsFree tools
Reconstitution calculator
Vial mass and bacteriostatic water in, mg/mL concentration and per-aliquot amounts out.
Cost per mg calculator
Compare up to four vials on cost per milligram, and per milligram of active peptide.
Syringe units calculator
Turn an amount into a draw volume and a U-100 syringe reading, drawn on a syringe.
Vendor transparency scorecard
Score any supplier 0 to 100 on the weighted, checkable COA signals that are hard to fake.
vettingVetting & COAs
GLP Peptide Content Accuracy: Verifying a Label Claim on a Research COA
A purity percentage is not a milligram claim. How to verify GLP-class research peptide label claims using mass-spec identity and a quantitative assay figure.
Peptide COA Lookup: How to Verify a Certificate of Analysis Yourself by Accession Code
Learn to do a peptide COA lookup yourself: search the accession or batch code in the lab's public database, confirm HPLC plus mass spec, and catch fakes.
How to Vet a US Peptide Vendor: The Checkable-COA Method for Choosing a Supplier
How to vet peptide vendors in the USA: a checklist ranking suppliers on a named third-party lab, HPLC plus mass spec, and a COA you verify before you pay.
How Vendors Fake a COA: Chromatogram and Document Forensics on a Fake Peptide COA
How a fake peptide COA is built: forged chromatograms, recycled lot numbers, reused lab letterhead, clone storefronts, and the one check that defeats them.
HPLC vs Mass Spec on a Peptide COA: Why 99% Purity Does Not Prove Identity
A 99% HPLC purity number says nothing about identity. Only the mass spec trace proves the peak is the right molecule. How to read both on a peptide COA.
Independent Peptide Testing Labs: Directory of Labs, Methods, and Public COA Verification URLs
A verified directory of independent peptide testing labs: location, analytical methods, and the exact public URL where you can check a COA number yourself.
Janoshik vs Finnrick: Comparing the Peptide Testing Labs (and Why the Lab Name Is Not the Proof)
Janoshik vs Finnrick: one is a lab that tests the samples, one is a platform routing them to seven labs. Compare methods, COA lookup and what a name proves.
Peptide COA Glossary: How to Read Every Term on a Certificate of Analysis (+ Legit Checklist)
Plain-English peptide COA glossary: HPLC purity, mass-spec identity, net peptide content, TFA salt and lot numbers, plus a 7-question is-this-COA-legit check.
Peptide Endotoxin and Sterility Testing: The COA Section Almost Nobody Publishes
HPLC purity and MS identity say nothing about contamination. Here is what USP 71 sterility and EU/mg endotoxin testing prove, and why most COAs skip both.
Peptide Lab Test Results: What Independent Testing Really Shows About Failure Rates
Peptide lab test results, read by failure mode: wrong identity, short fill, impurity. What the published forensic studies found, and how to verify one lot.
TB-500 vs BPC-157: What Each Peptide Is, How They Differ, and How to Vet a COA Before You Buy
TB-500 vs BPC-157 for research use: what each peptide is, how the mechanisms differ, and how to vet a third-party HPLC and mass-spec COA before you buy.
Is BPC-157 Legal in 2026? FDA Status, Compounding, and What RUO Really Means
A 2026 explainer on the regulatory status of BPC-157: not FDA-approved, on the 503A Category 2 bulks list, sold research-use-only. What that means for buyers.
Best Peptide Sources on Reddit (2026): What the Threads Actually Say
Reddit bans peptide vendor rankings; what survives is a method: demand a batch-specific COA that verifies on a third-party lab's own database. Here's how.
How to Read a Peptide COA: Real vs Fake (with a Worked Janoshik Example)
A peptide COA is real only when a named lab ran both HPLC and MS and you can reopen that exact record yourself. Here is how to verify one and catch a fake.
Peptide Vendor Red Flags: 9 Signs of a Scam Source
The biggest peptide vendor red flag is a third-party COA you cannot verify yourself. Here are 9 signs of a scam source you can check in under two minutes.
closed-vendorClosed vendors
Peptide Vendors Shut Down: The 2026 Graveyard and the Red Flags That Showed Up First
Which peptide vendors shut down and what was checkable beforehand: FDA warning letters, a federal guilty plea, and the COA checks that flag the next one.
Science.bio Shut Down: What's Confirmed and How to Vet a Replacement Source (2026)
Science.bio announced a permanent closure in early 2026. What is confirmed, what is still rumor, and how to vet a replacement research source on real COAs.
Amino Asylum Shut Down: What Happened and How to Vet a Replacement Source (2026)
Amino Asylum's store went dark in June 2025 and hasn't returned. Here's what's confirmed, what's rumor, and how to vet a replacement source on real COAs.
Peptide Sciences Is Closing: Vetted Alternatives and How to Choose (2026)
Peptide Sciences went dark in early 2026. Dispute any pending charge, then vet every replacement vendor on named, third-party lab COAs before you pay a cent.
compoundCompound guides
BPC-157 Peptide: A Research Guide to the Science and the COA Test That Separates Vendors
BPC-157 is sold widely but rarely ships an independently verifiable third-party COA. Here is what the research shows and how to vet a vendor before paying.
GHK-Cu (Copper Tripeptide) Research Guide: What the Studies Show and How to Vet a COA
GHK-Cu is a copper tripeptide studied in collagen, wound-repair, and gene-modulation research. What it is, the real citations, prep math, and COA vetting.
GLP-3 RT Research Peptide: How to Vet the COA Before You Buy
GLP-3 RT is an unapproved research-only peptide. See how to read a third-party COA, confirm HPLC and mass-spec identity, and check purity before you buy.
Peptide Half-Life Reference Chart: Verified Plasma Half-Lives, With the Human vs Animal Source Flagged
Peptide half-life reference chart with plasma values sourced to labels and trials, each flagged human or animal, and none-published where no PK study exists.
Peptide Molecular Weight Reference: Formula, MW, CAS and Sequence Length
Molecular weight, molecular formula, CAS number and sequence length for BPC-157, TB-500, GHK-Cu, Tesamorelin and more, each value checked against PubChem.
TB-500 Peptide Research Guide: The Actin-Repair Science and the Third-Party COA Test
TB-500 is a Thymosin Beta-4 fragment studied for tissue repair. Learn the actin-regulation research, RUO status, and how to vet a vial's third-party COA.
ARA-290 (Cibinetide) Peptide: Research Guide, Handling Math, and How to Vet a COA
ARA-290 (cibinetide) is a research-use-only EPO-derived peptide studied in preclinical neuropathy and tissue-protection models. Prep math and COA vetting.
Epitalon (Epithalon / AEDG) Research Guide: What the Studies Show and How to Vet a Vial
Epitalon is the Ala-Glu-Asp-Gly tetrapeptide studied in telomerase and pineal-regulation preclinical research. Real citations, prep math, and COA vetting.
Tesamorelin Peptide: Research Guide, Real Citations, and How to Verify a Vendor COA
Tesamorelin is a stabilized GHRH analog studied in GH-axis and visceral-fat research. What it is, the real citations, the lab-prep math, and COA vetting.
Thymosin Alpha-1 Peptide: Research Readouts, Reconstitution Math, and the COA Question (2026)
Thymosin Alpha-1 is a 28-amino-acid immunomodulatory research peptide. What peer-reviewed studies report, the reconstitution math, and how to vet its COA.
utilityHandling & prep
Bacteriostatic Water COA: How to Verify the Diluent, Not Just the Peptide
A real bacteriostatic water COA lists sterility, endotoxin, benzyl alcohol assay, pH and a matching lot. Here is how to read one and when to reject a vial.
How to Reconstitute Research Peptides: The mg/mL Calculator, Worked Tables, and Why You Trust the COA Mass
How to reconstitute research peptides: the mg/mL formula, worked tables for 5-50 mg vials, aliquot math, and why you trust the COA mass, not the label.
Peptide COA Test Date: What Freshness and Stability Actually Certify
A peptide COA test date certifies one lot on one day. What it proves, what it cannot say about a reconstituted solution, and how to get a current lot report.
How to Reconstitute Peptides With Bacteriostatic Water: The RUO Lab-Prep Math
Bacteriostatic water is sterile water preserved with 0.9% benzyl alcohol. The reconstitution math with a worked example, plus handling rules for research vials.
blendBlends
Peptide Blend COA: How to Verify Each Component, Not Just the Purity %
One HPLC purity number cannot describe a peptide blend or prove its ratio. What a real blend COA must show per component, and the four shortcuts vendors take.
Glow Peptide Blend (GHK-Cu + TB-500 + BPC-157): Research Guide and Where to Buy
The Glow blend co-lyophilizes GHK-Cu, TB-500, and BPC-157 for research use only. See the reconstitution concentrations and how to check a COA before you buy.
KLOW Peptide Blend (BPC-157 + TB-500 + GHK-Cu + KPV): Explainer and Where to Buy
KLOW is a research-use-only vial blending BPC-157, TB-500, GHK-Cu, and KPV. Here is what each peptide is, the reconstitution math, and how to vet a vendor COA.
Wolverine Peptide Blend (BPC-157 + TB-500): Research Guide and Where to Buy
The Wolverine peptide blend is a research-use-only 1:1 mix of BPC-157 and TB-500. Here is the reconstitution math and how to vet a vendor COA before buying.