Independent · no paid placement·4 weighted criteria, disclosed·Updated June 2026
Peptide Purity Rankings
peptidepurityrank.com
Independent vendor rankings

Purity, ranked.

We turn scattered lab reports, policies, and reviews into a single, defensible ranking — so quality is something you can see, not something you’re told.

This quarter’s review
10
Vendors evaluated
240+
COAs reviewed
6
Weighted criteria
0
Paid placements
The rankings

Top-ranked vendors — Overall

Composite score (out of 10) reflects lab verification, analytical quality, transparency, and value as of June 2026. Select a peptide to re-rank the list.

Avg. purity is the mean HPLC purity across that vendor’s most recent independently tested batches. Scores are a weighted composite of the four criteria below. Pricing reflects 10mg (or calculated equivalent) as of June 2026, pulled from vendor sites where available; prices fluctuate and bulk discounts often apply.

Methodology

Four criteria, weighted and disclosed.

Every score traces back to a published criterion and a source. Where evidence is missing, we say so — and no vendor pays for placement.

How the composite score is weighted — 100 points total
38%
27%
18%
17%
Lab Verification
Analytical Quality
Transparency
Value & Reliability
01Lab Verification
38%
weight
Key factors
Independent testing (Janoshik preferred)verifiable COAsbatch-specific reports
Why it matters
Gives objective proof the peptide is real and properly made — the strongest defense against fake or under-dosed products.
02Analytical Quality
27%
weight
Key factors
HPLC purityMass Spec identitydose accuracyimpurity levels
Why it matters
Shows whether the peptide will actually work consistently in research.
03Transparency
18%
weight
Key factors
Public COA accessbatch traceabilityeasy verification (QR / portal)
Why it matters
Lets buyers independently check and confirm quality before and after purchase.
04Value & Reliability
17%
weight
Key factors
Fair pricing for qualityinsulated shippingreliable delivery & support
Why it matters
Delivers strong value while protecting product integrity and minimizing problems.
P—01
Independence
No vendor pays for placement. Rankings answer to the methodology, never to a relationship.
P—02
Transparency
Every score traces back to a published criterion and a source. We show the work.
P—03
Rigor
Third-party COAs, purity data, and consistency over time outweigh marketing claims.
P—04
Clarity
Complex evidence rendered legible at a glance. Calm surfaces, no noise.

Common questions

Do vendors pay to be ranked?
No. Placement cannot be purchased. Any affiliate or data relationships are disclosed openly on our methodology page.
Where do the lab reports come from?
Each verified vendor links to a third-party Janoshik COA. We review HPLC and MS data for purity and identity.
How often are rankings updated?
Composite scores are refreshed each quarter, or sooner when a vendor publishes new batch testing.
Is this medical or dosing advice?
No. Products are evaluated for laboratory research use only. We offer no medical, dosing, or human-use guidance.
Peptide Purity Rankings

The independent standard for evaluating research peptide vendors — ranked on verified lab testing, transparency, and quality.

Content is provided for research and informational purposes only. Products are evaluated for laboratory research use; the site offers no medical, dosing, or human-use advice. Not for human consumption.

© 2026 · v1.0