If you want to know whether a product claim, policy statement, newspaper article or advert is backed by scientific evidence, ask.

Ask for Evidence is a campaign that encourages people to request evidence for claims they come across. We built this tool to make asking as easy as possible and to create an Ask for Evidence log recording all the evidence hunting going on.

Use this tool to send a request for evidence, or to tell us about your experience asking for evidence.

Before you start, read our guide to asking or stories of other people’s experiences.