Independent scoring. We earn 20% first-order / 10% repeat commission on Alpha Pro Peptides links — it never changes a score. How that works ↓
Alpha Index.
Research peptide vendors · 2026

The peptide vendor audit, ranked before we know the margins.

Independent scam audits and side-by-side comparisons of research-peptide vendors — purity, COAs, price-per-mg and red flags. No sponsored fluff.

See the rankings ↓How we score →
Best value · Peptide Partners $4.20/mg BPC-157Visit Alpha Pro →

Best peptide vendors 2026

Verified 2026-06-01 · 90-day re-audit cycle · changelog

Sort it yourself — we don’t hide the losers.

Protide Health product

Protide Health

Verified data

What stands out: Public batch COA library (HPLC/MS + endotoxin)

What to know: Credit-card only

Purity99.5% · HPLC
Price / mgNot published
COA3rd-party (Finnrick)
ShipsNot published
Last checked 2026-06-03
8.9
/ 10
Visit Protide →Read full audit →
Alpha Pro Peptides product

Alpha Pro Peptides

Referral partner

What stands out: Broadest catalog among seeded vendors (25+ compounds incl. GLP-1/2/3, rare peptides like Dihexa, Cerebrolysin, Pentadeca Arginate)

What to know: Public batch-traceable COA library must be verified — purity/transparency confidence is provisional until hosted PDFs + named lab are confirmed

PurityVendor-claimed
$/mg · GLOW blend$1.71
COAVendor COA ↗
ShipsStandard 3-5 business days
Last checked 2026-06-01
8.6
/ 10
Visit Alpha →Read full audit →Referral partner — how we label
Peptidology product

Peptidology

Verified data

What stands out: ISO 17025-accredited dual-lab testing (Vanguard + Eagle)

What to know: No public affiliate program (discount codes only)

Purity99% · HPLC
Price / mgNot published
COA3rd-party (Vanguard Laboratories (ISO 17025))
ShipsNot published
Last checked 2026-06-03
8.6
/ 10
Visit Peptidology →Read full audit →
Modern Aminos product

Modern Aminos

Verified data

What stands out: Named labs: Vanguard, Chromate, Freedom Diagnostics

What to know: Affiliate commission not public (GoAffPro portal-only)

Purity99% · HPLC
Price / mgNot published
COA3rd-party (Vanguard)
ShipsNot published
Last checked 2026-06-03
8.5
/ 10
Visit Modern →Read full audit →
Cernum Biosciences product

Cernum Biosciences

Verified data

What stands out: >99% purity with batch-specific HPLC/MS COAs

What to know: Premium pricing

Purity99% · HPLC
Price / mgNot published
COA3rd-party (Janoshik)
ShipsNot published
Last checked 2026-06-03
8.4
/ 10
Visit Cernum →Read full audit →
Pure Tested Peptides product

Pure Tested Peptides

Partial data

What stands out: Public, no-login batch COA library

What to know: Specific lab names not disclosed

PurityNot published
Price / mgNot published
COAClaim only
ShipsNot published
Last checked 2026-06-03
7.6
/ 10
Visit Pure →Read full audit →
Verified Peptides product

Verified Peptides

Partial data

What stands out: 400+ published COAs with batch numbers and dates

What to know: Third-party lab name NOT disclosed - COAs unverifiable

PurityNot published
Price / mgNot published
COAClaim only
ShipsNot published
Last checked 2026-06-03
7.5
/ 10
Visit Verified →Read full audit →
All 25 vendors →

What the verdict cost.

0
vendors audited
0
scoring axes · weights public
0
labs named (MZ Biolabs, Finnrick, TrustPointe)
Jun 2026
last verified
How Alpha Index weights its score — Transparency 40%, Purity 30%, Shipping 15%, Value 15%
The rubric

How we rank

One formula, the same for every vendor including our partner. Argue with the weights — that's the point.

Transparency40%
Purity30%
Shipping15%
Value15%

Overall = 0.40 × Transparency + 0.30 × Purity + 0.15 × Shipping + 0.15 × Value

How each axis is scored

Transparency (×0.4). COA depth, named third-party labs, breadth of test types (HPLC base; +MS, +LAL, +heavy metals, +sterility), public batch traceability. Claim-only purity (no hosted PDF) caps this axis.

Purity (×0.3). Median/recent batch purity from hosted COAs + independent lab confirmation (Finnrick/Janoshik). Self-reported '99%+' with no batch PDFs scores low.

Shipping (×0.15). US-domestic speed/reliability and stock consistency from real shipping data; international-only or undisclosed scores lower.

Value (×0.15). Purity-adjusted price per mg vs the cross-vendor median for the same peptide/vial; discount-dependency penalized.

Real third-party Certificate of Analysis — Peptide Partners Selank 30mg, Chromate lab, 99.95% HPLC purity
Real COA · Peptide Partners · Chromate (independent lab) · verifiable at chromate.org/verify
The receipt

Every score traces to a real lab's COA.

This is an actual third-party report — Chromate, an independent lab, ran RP-HPLC on a Peptide Partners batch and logged 99.95% purity, signed and QR-verifiable. Top vendors back every batch this way (Chromate, Finnrick, TrustPointe, MZ Biolabs, Janoshik). Claim-only purity, with no hosted report, is marked as such and capped on the Transparency axis.

Every COA on the board is a real batch report like this — scan the lab's code and verify the lot yourself.

Our picks by category.

Each pick is computed from the same axes — curation, never an override of the ranked table.

Most transparent
Ascension Peptides
Deepest COA + named-lab disclosure.
Highest verified purity
Peptide Partners
99.8% lab-verified.
Best US shipping + catalog
Alpha Pro Peptides
Fastest domestic + broadest range.
Best value / mg (BPC-157)
Peptide Partners
$4.2/mg, purity-adjusted.

Know the compound first.

Cited research and balanced expert opinion — before you compare a single vendor.

Research guide

TB-500

TB-500 is a synthetic pentapeptide fragment corresponding to amino acids 17-23 of the full…

Research guide

Retatrutide

Retatrutide (LY3437943) is a 39-amino-acid synthetic triple hormone receptor agonist pepti…

Research guide

CJC-1295

CJC-1295 is a synthetic peptide analog of growth hormone-releasing hormone (GHRH) that inc…

Research guide

Semax

Semax is a synthetic peptide analog of the ACTH(4-10) fragment (a segment of adrenocortico…

The real cost is price per milligram.

Vial price hides value. A $45 vial and a $100 vial tell you nothing until you divide by mg at verified purity. Purity-adjusted, that's what these numbers do.

$4.20/mg
Peptide Partners · BPC-157 10mg
Lowest verified $/mg
$5.00/mg
Alpha Pro · Semaglutide 20mg
Our partner · research use only
$6.00/mg
Ascension · BPC-157 10mg
Premium list price
Visit Alpha Pro →Compare BPC-157 vendors →
The scoring engine is walled off from commission — our editorial-commerce firewall

Why trust this comparison

  • Every vendor is scored from real evidence on four public, weighted axes — before we know any margins.
  • Purity claims are cross-checked against named third-party labs (MZ Biolabs, Finnrick, Janoshik). Claim-only purity is marked as such.
  • The scoring code can't read which vendor pays us — the editorial-commerce firewall is enforced in software.
  • We disclose the 20% / 10% Alpha Pro commission on every page, above the first link.

Vendors out-rank our own partner: Peptide Partners (9.0) and Protide Health (8.9) and Ascension Peptides (8.8) both score above Alpha Pro (8.6). We left it that way.

What we don’t do

  • We’re not a lab. We don’t test products ourselves; we reproduce vendor and third-party data with dates noted.
  • We don’t give medical, dosing, or usage guidance. Everything here is research-use framing only.
  • Products are listed as sold by the vendor, for laboratory and research use only.
  • We don’t publish star ratings or purity numbers we can’t source.
See something wrong, or run a vendor we missed?Suggest a vendor or dispute a score →
Audited by a named reviewer, dated, and re-checked
Alpha Index Lab Desk
Reviews third-party COAs & price data · Updated 2026-06-01
Verified 2026-06-01 · 90-day re-audit cycle · changelog