Question 1

How is the ranking computed?

Accepted Answer

Vendors are scored on five weighted axes — testing rigour, purity (HPLC/LC-MS/CLND), EU-friendliness (warehouse + GDPR), value (price band + free shipping threshold), and trust (Trustpilot signal + incident history). Composite score is published per page; the methodology page covers every weight and rubric.

Question 2

Why are flagged vendors still listed?

Accepted Answer

Flagged vendors retain their ordinal rank because the comparator's job is full visibility, not hiding choices. A warning banner appears on each flagged vendor's own page; the comparator's default filter keeps them visible so users see every option in the market.

Question 3

Are the prices live or snapshot?

Accepted Answer

Listings are snapshot at the per-region data-refresh date shown on each vendor page. Vendor catalogues move faster than our refresh cadence — verify the current price on the vendor's own site before purchase. The price band on the comparator is the historical spread used for ranking.

Question 4

Why no Person.author byline?

Accepted Answer

The site's authority is Organization-only by editorial policy. Every review and ranking is authored by PeptideGuide as a whole, with the methodology, evidence chain, and editorial trust footer doing the work a Person.author byline would do on a generalist publisher. The /methodology and /about pages cover the editorial structure.

#	Vendor	HQ	Testing	Purity	EU	Trustpilot	Price band	Affiliate	Score
01	Polar PeptidesVID-POLAR-PE · Editor's pick	CA	2-param	99.9%	Y	4.7/5	€35–180	10% per sale	9.1
02	Particle PeptidesVID-PARTICLE	SK	6-param	99.8%	N	4.9/5	€30–160	10%	8.8
03	QSC PeptidesVID-QSC-PEPT	CN	3-param	99.5%	Y	—	€8–45	—	8.4
04	Peptide WarehouseVID-PEPTIDE-	CA	1-param	98.5%	Y	4.5/5	€28–140	—	8.3
05	SwissChemsVID-SWISSCHE	US	2-param	99.3%	N	4.7/5	€22–150	20% per sale	7.6

All 5 vendors.
Nothing hidden — Canada.

Vendor register

All 5 vendors.Nothing hidden — Canada.

Vendor register

All 5 vendors.
Nothing hidden — Canada.