I am looking at different ceramic frying pans, e.g. this lagostina one, but from reading the product description it is really hard to figure out what metal is the main body of the pan made of. For health reasons, I'm hoping to find one that uses steel rather than aluminum, but the manufacturers seem reluctant to explain it. Is there a general recommendation for how to find a ceramic pan that uses safe metals?
If the manufacturer uses the metal in the description or marketing material, that's the best way to tell. Enameled cast iron comes to mind.
Why, though, are you worried about the metal under the 'ceramic'? The enameled cooking surface should be nonporous, so the underlying metal won't ever contact the food unless the surface is damaged, in which case you would probably want to discard the cookware regardless or the underlying metal. I'd be more worried about the material used in the enamel than the metal underneath when considering the safety/health risks of enameled cookware.