Useful To The Reader
We only recommend products when we believe they are genuinely useful for the reader's stated goal. A commission opportunity is not enough; the supplement must have a credible reason to be bought.
Affiliate disclosure
Product links must not change evidence ratings.
Evidence Stack may earn a commission if a reader buys through some product links. As an Amazon Associate I earn from qualifying purchases. Ratings, caveats, and source summaries are editorial decisions and are not increased because a product is available commercially.
Eligibility Threshold
Only supplements with strong or good evidence become candidates for product links, and specific products still need dose, label, and quality checks.
Product Matching
A linked product must match the ingredient form, dose, and use case supported by the research. Brand claims are not accepted as evidence.
Reader Trust
Weak products remain visible as non-recommendations. We would rather leave a page unmonetized than attach a link that undermines the evidence standard.
Amazon Link Rules
Amazon links are disclosed near the relevant recommendation. We do not display Amazon prices, star ratings, review quotes, or availability unless they are served through Amazon-approved tools.
No Hidden Redirects
Product links should make the destination clear and use compliant link attributes. We do not use cloaked or shortened links that hide where a reader is going.