Last updated: September 2026

This page is the formal version. The fuller explanation of how money shapes — and doesn’t shape — what gets recommended here is on the How I Test page.

Affiliate links

Some links on this site are affiliate links. If you click one and buy something, I may receive a commission from the retailer. The price you pay is exactly the same either way; the commission comes out of the retailer’s margin, not your pocket.

This site participates in the Amazon Services LLC Associates Program, an affiliate advertising programme designed to provide a means for sites to earn advertising fees by advertising and linking to Amazon. As an Amazon Associate I earn from qualifying purchases. This site also participates in affiliate programmes operated by other retailers and manufacturers.

Affiliate relationships do not determine which products are recommended or how they are ranked. Products are chosen on independent testing results, third-party certification, and published specifications. In several places on this site the recommended option is the one that pays least, and in several more the recommendation is to buy nothing at all.

Advertising

Some pages display advertising served by third-party networks. These advertisements are selected automatically by the network and are not endorsements. An advertisement appearing on this site does not mean the product is recommended here — in some cases the surrounding article explicitly says the opposite.

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What this site does not do

  • No sponsored posts, paid reviews, or paid placements.
  • No payment accepted in exchange for a mention, a link, or a ranking position.
  • No free product accepted on condition of a favourable review. Where a product has been supplied free of charge, the review says so plainly.

If any of this changes, this page is updated before the change takes effect.

Not professional advice

Nothing on this site is medical, legal, or professional advice. It’s research and opinion, assembled by someone who is not a doctor, a toxicologist, or an industrial hygienist. For a specific health concern, talk to a qualified professional.

Questions about any of the above? Get in touch.