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I’ve used Stans based on availability, schwalbe blue dot since I got it with my schwalbe tyres and now on caffelatex fro @thecycleclinic I must admit they’ve all sealed pretty well and I’ve never been worried which one is in the tyre. I probably won’t go back to Stans though. Not sure why which isn’t that helpful.
If you want to be strictly on-point, avoid the glitter trick (microplastics). The rest of the goop is pretty harmless, it's mostly water and most of the rest is natural latex, which is food for microbes. You're probably doing more harm with the wear particles from your synthetic rubber tread.