How we score UK peptide suppliers
The same published evidence rubric used by PeptidePrices.
Source methodology reviewed 23 October 2026. Each UK supplier profile retains its own review date, and each price and coupon has its own observation date.
The four factors
Every vendor is scored on four criteria, each rated from 0 to 10 in half-point steps. The overall evidence score is the weighted sum of those four ratings, rounded to the nearest half point. A recorded editorial overall decision remains identified in the supplier review.
COA practices 40%
Independent laboratory evidence, report authenticity, the breadth of the test panel, reported results, and how precisely the reports match the products offered.
Customer reputation 20%
What independent customers and reviewers report about the vendor, with source, date and sample size kept alongside the claim. Merchant-hosted reviews remain labelled as such.
Transparency 20%
Who is behind the business, the evidence for its operating identity, and the information it publishes about its products, policies and testing.
Operations 20%
Payment options, dispatch and delivery terms, customer support, and the handling of returns and disputes.
Exact certificate matching
Exact listing matches use the vendor, compound, formulation and strength. When an eligible report covers another strength or package size of the same compound and formulation, it can be shown as related evidence with its tested strength. Historical reports retain their original report dates.
- COA verified
- The issuing laboratory's record confirms the report. The report's vendor attribution and product match are recorded separately.
- View COA
- The retained file is available to read. Document-only evidence and an unavailable issuer portal retain their specific status.
- Conflict or lookup miss
- The record states the conflicting fields or the unsuccessful lookup. An unresolved lookup remains unresolved evidence.
Browse the UK supplier COA library · Read laboratory reviews
How we check a supplier and its reports
We begin with the supplier’s public catalogue, company information, ordering policies and retained laboratory reports. For each report we record the issuing lab, reported product and strength, report date, and whether the issuer’s own record confirms the document. A laboratory lookup miss, unavailable portal, or conflict remains visible in its own state.
Our score combines the four factors above. The factors are judgments based on the evidence available at the review date, not a laboratory measurement or a guarantee about every product. The supplier review explains the factors and links to the supporting evidence.
Report coverage differs by supplier. A report for one listing is not automatically a report for the rest of the catalogue. The COA library lets readers inspect each retained file and its verification state.
UK prices, offers and delivery
Our UK catalogue records observed prices in pounds, alongside the actual collection date. We compare matching products and formulations, taking package size and the amount in each unit into account. A listed product price is not a checkout total.
Check the coupon conditions, delivery charge and free-delivery threshold at the supplier’s checkout. Shipping and payment information is recorded separately from price, and unknown terms are not treated as free delivery. Coupons carry their own verification dates.
Listings and terms can change between observations. The vendor review supplies context about the business and policies, while each certificate remains tied to its recorded product and test.
How we make money
Qualifying purchases through some vendor links may earn PeptidePrices a referral fee. Affiliate status has zero weight in an evidence score. Vendors cannot purchase a higher rating.