Peptide vendors ranked by lab data
and price per milligram.
We index what vendors publish about the lots they ship: HPLC purity, mass spectrometry identity, and cost normalised to $/mg. We do not sell peptides and we do not recommend doses.
What a milligram costs, by compound
Three vendors indexed: Amino Club, EZ Peptides and Ascension Peptides. All three publish the same two COA panels, HPLC purity and mass spectrometry identity, and none publishes the other five. Documentation is a tie, so price is the deciding variable.
| Compound | Best cost per mg | Vendors | Vial sizes |
|---|---|---|---|
| BPC-157 | $3.15/mg | 2 | 10 mg |
| GHK-Cu | $0.80/mg | 3 | 5 to 100 mg |
| Retatrutide sold as GLP-3 | $5.33/mg | 3 | 10 to 30 mg |
| Glow Blend | $2.40/mg | 3 | 5 to 30 mg |
| KLOW Blend | $2.64/mg | 3 | 5 to 30 mg |
| KPV | $3.20/mg | 2 | 10 mg |
| NAD+ | $0.11/mg | 2 | 250 to 500 mg |
Swipe the table sideways to see all three vendors
Best price is the lowest cost per milligram across every vial size a vendor lists, so a large vial that works out cheaper is not hidden by its sticker price. Figures reflect the most recent index run. None of the three publishes net quantity, endotoxin, heavy metal, conformity or sterility data. What those panels would tell you →
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Verify a peptide vendor in 60 seconds
Six checks, none of which require a laboratory or trusting us. Every one is answerable from documents the vendor has already published. A supplier failing any of them is not a borderline case.
- Is there a certificate at all, before you pay?A COA published on the product page beats one produced on request after the order. If it only appears after payment, it cannot inform the decision it is supposed to inform.
- Does the lot number on it match your vial?A certificate for a different lot is a document about someone else’s material. This single check eliminates more bad orders than any other.
- Is the laboratory named, independent and contactable?An unnamed lab is an unfalsifiable claim. Search the name; if it does not exist separately from the vendor, the certificate is self-issued.
- Is identity established, not just purity?Purity is a percentage of whatever is in the vial. Only mass spectrometry says the main peak is the peptide you ordered. HPLC alone cannot.
- Does the molecular weight match the published formula?Look it up once. A mismatch means a different molecule, and it is the fastest way to catch a truncated sequence or the wrong salt form.
- Does the company disclose a legal entity and address?No entity, no recourse. This has nothing to do with chemistry and everything to do with what happens when a lot is wrong.
What each compound actually is
Definitions first, marketing never. Every profile states what the molecule is, what it is not, and what a certificate has to show.
Glow, KLOW, Wolverine: vendor names, not molecules
None of these is a compound. Each is a vendor label for a vial holding two or three separate peptides, which changes entirely what a certificate has to prove.
Glow
GHK-Cu, BPC-157 and TB-500 co-lyophilised in one vial. The name carries no formulation standard, so ratios differ between vendors.
What is in a Glow vial → Glow vendor review → Glow vs NAD+, and why the comparison fails →KLOW
Glow plus KPV. Four components in one vial, which means a single purity figure on the certificate is uninformative by construction.
KLOW overview and sourcing → KPV purity and vendor breakdown →Wolverine
BPC-157 and TB-500 used together. That is the whole definition, and the choice is really blend versus two separate vials.
What the Wolverine stack is → Reading a TB-500 certificate →89 analyses, sorted by what you are checking
Every article on this site answers a documentation question: what a test proves, what a vendor publishes, or what a milligram costs.
Research & analysis
Deep dives, vendor news, and lab-report breakdowns.
Klow Peptide Overview: Where to Buy Safely
A scientific guide to the klow peptide (GHK-Cu, BPC-157, KPV & TB-500 blend), covering how to verify purity and source it safely.
KPV Peptide: Purity & Vendor Breakdown
A purity and vendor breakdown of the KPV peptide: what the lab reports reveal and where to source it reliably.
Glow Peptide: Does It Work & Where to Buy?
An in-depth look at the popular GHK-Cu, BPC-157 & TB-500 blend, with vendor scores, purity data, and what the research says.
What people ask before they buy
Short answers to the questions that decide an order. Longer versions live in the guides.