Is buckwheat groats high in sulfites?

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Gluten free as a seed, unreliable as a product. Most Japanese soba noodles are cut with wheat flour and only juwari soba is 100 percent buckwheat, while buckwheat flour is often milled on shared equipment. With celiac disease the certification matters more here than it does for rice / Buckwheat is a real IgE allergen, not only a sensitivity. It is a mandatory labeled allergen in Japan because soba is a staple there, reactions are well documented in Korea as well, and they can be severe. Buckwheat husk pillows are a recognized route of exposure alongside food / Moderate FODMAP by volume, graded B for total FODMAPs and B for fructans. A modest side portion of cooked groats suits most sensitive guts, while a large main-course bowl brings enough fructans to notice / Mild B for oxalate, so it is not the oxalate-free option that plain rice is. On a strict low oxalate protocol buckwheat belongs on the counted list rather than in the free column / Kasha and raw groats are the same seed at different roast levels, but packets labeled buckwheat can also mean flour, noodles or a pancake mix with wheat, egg or milk in it. Log the format, not just the word