How we test
How every product is scored, and what we do to keep the scores honest.
Our scoring method
Every product is scored out of 10 using the same four criteria, weighted the same way each time: ingredients and composition, independent testing and certification, performance in our own use, and value for money.
Evidence and sources
We prefer peer-reviewed research, regulator guidance and independent laboratory results. When evidence is weak or mixed we say so rather than rounding it up.
Independence
We buy products ourselves or disclose when samples are supplied. Affiliate links never change a score. See our affiliate disclosure.
Updates and corrections
Each review shows when it was last tested and each guide when it was last reviewed. If you spot an error, contact us and we will correct it and note the change.
Placeholder text: review and replace with your final methodology.