Affiliate disclosure

Some links on this site are affiliate links. If you click one and buy something, the retailer or brand may pay us a commission. You pay the same price.

Links that go through /go/ are the ones that can earn money. They are marked sponsored for search engines.

As an Amazon Associate, circadian.supply earns from qualifying purchases.

What commissions do not change

• Evidence grades. A grade rates the research on a product type. No brand can buy one.
• Rankings. Products are ranked on how well they do the job and who they suit. Products with no affiliate program are listed and can rank first.
• What we say. If a product type has weak evidence, we say so on the page that earns money from it.

This disclosure follows the US Federal Trade Commission’s guidance on endorsements (16 CFR Part 255).