I'm reviving this forum thread because I need a bit of clarification and hope you can help. I understand balsamic vinegars have naturally occurring sulfites but I would like to know how to tell the difference between added sulfites and the natural types. I believe if the label says "may contain sulfites", 'contains sulfites" or 'naturally occurring sulfites" they are compliant, but if "sulfites" is listed as an ingredient they are not compliant. Do all Organic balsamic vinegars only have natural sulfites? (I'd still read the label) I feel like I'm really stuck on this, and really I could just forgo this product for the 30 days if I can't find a compatible one.