How we make money

Compare CGM earns affiliate commission when a reader buys through some of the links on this site. The price you pay is the same either way.

Commission does not influence our rankings or verdicts. Devices appear in comparisons whether or not we earn anything from them, and several of the devices we rate most highly pay us nothing at all.

Every link that earns us money is labelled where it appears, not only here. We do not run display advertising, and we do not sell supplements.

Supplement pages carry commercial links only where the law of your country allows a supplement to be sold with a health claim attached. In most of the countries we cover it does not, so those pages carry no links at all and say so.

As an Amazon Associate I earn from qualifying purchases. We may earn a commission if you buy through this link. It never changes what we recommend.