Hi all. I tested sulfites a few times and each time they register at 0 on the urine strips. I find that confusing because my urine sulfates consistently register > 800 and even occasionally at >1200 . I took NAC for years and glucosamine, MSM and chondroitin for a year. But I stopped them last year and NAC I stopped months ago. I've been eating low thiol for about a month or more. Any ideas what causes sulfites to be normal but not sulfates?