Our methodology

Exactly how we choose firms, what we verify, how we label prices — and what we refuse to do.

Which firms get listed

A firm appears in our directory only if, as of our last check, it meets all three:

• It operates an active public website offering GLP-related services — verified by a direct load check, not a database scrape.
• Its GLP service is real and current — service pages describing GLP audits, consulting, or a GLP-compliant lab, not just a keyword on a services list.
• It is not a “certification mill” — we exclude sellers of instant or guaranteed “GLP certification,” which does not exist.

What we verify — and what we don't claim

For each firm we record firm type, the services its own public materials describe, and who it fits. Every listed website was load-verified row by row on 2026-09-24 (curl, browser user-agent, redirects followed — final HTTP status recorded below). We aim to re-check quarterly.

How we label every price

GLP consulting fees are scoped per engagement, so firms publish no prices. Where we show figures, each row carries one of two labels:

None of these are quotes. Your fee depends on lab size, scope, and starting point. Treat every figure as a planning input and get scope and fee in writing.

What we will never do

• No star ratings or review scores. We have not hired these firms' clients and won't compress fit into a number.
• No testimonials. Every quote-like line on this site would be fabricated — so there are none.
• No pay-for-rank. Ever. Firms cannot pay to be listed, ranked higher, recommended, or have a profile softened. Some directories sell “featured” placement; we don't sell placement at all.
• No invented statistics. Every number on this site has a clickable source.
• No fake “GLP certification.” We say plainly, everywhere it matters, that no private firm grants GLP compliance.

How we make money

When you request quotes, matched providers may pay us a lead or referral fee. That payment cannot change which firms we list, what our guides say, or which firms we recommend — the firewall is absolute, and firms can't buy their way around it.

Corrections

Wrong fact, stale link, firm missing? Tell us. We check corrections against the firm's own public materials and note material fixes on the affected page with a date.

Verification log

Row-level and append-only: every listed firm website, the exact URL checked, the final HTTP status, and the date checked.

Method: sequential curl checks with a browser user-agent, following redirects; the final status after redirects is recorded. All 13 returned HTTP 200.