Additives in wine -- an issue that will only get hotter along with the planet. While additives are fairly strictly regulated in most countries, some countries fiddle with your wine more than others. Shining example: our very own US of A. Here, it seems, anything goes.
How would I know this? I checked out the OIV's comparative checklist of permitted additives. I quote Jancis Robinson today:
...there's a handy comparative table put together by the OIV (Organisation
Internationale de la Vigne et du Vin, or International Organisation of
Vine and Wine), and unlike many of these resources, it is pretty up to
date (Jan 2007).
Go to this link for the table, all 14 pages of it. The OIV home page is here.
Do your own compare-and-contrast, nation by nation. It isn't very heartening.