Contact
Every message goes to one inbox and a person reads it. The fastest way to get a useful answer is to say which page you were on.
Report a data error or an outdated price
This is the one we most want to hear about. Prices and certifications change, products get reformulated, and a stale number on a comparison table is a real problem for a site whose whole purpose is being checkable.
Email a correction — include the page URL and what looks wrong. Fixes are published to our corrections log.
Questions about our evidence or methodology
How we pick products, calculate cost per effective dose, and decide what counts as evidence is documented in our methodology and editorial standards. If something there is unclear or you think a judgement call is wrong, write to us — disagreements about method are welcome and we will tell you if you have changed our mind.
Licensing, data, and press
Our dataset is published free under a permissive licence — see the dataset page — and journalists can find figures and background in the media kit. For anything not covered there, including bulk or commercial use of the data, email us.
Advertising and commercial enquiries
Display advertising on this site is sold programmatically through third-party networks, not directly by us. We do not accept payment to change an evidence rating, add a product to a comparison, or alter a ranking, and we decline sponsored-content requests. Affiliate relationships are disclosed on every page that contains them.
We aim to reply within a few business days. This site publishes health information, not medical advice, and we cannot answer questions about your personal health, symptoms, or medications — please speak to your doctor or pharmacist for those.