I get the USDA Organic one which should handle the pesticides issue. I have asked the vendor to ensure the vendor test for heavy metals.

Note that psyllium is unique in that not only does it not absorb, but it also binds to everything on the way out, so the risk is low. Fwiw, I have had blood and urine tests for lead twice.

Finally, it's not as if the US is great with pesticides. We literally deliberately include PFAS in our pesticides.

why use phylllium, it's clear that fiber in general works. plenty of sources for that, and ways to get it.

"Soluble" fiber works. If it's not soluble, it might not bind bile. Psyllium is a convenient source of it, although it's been difficult for me to time it right to avoid meds for two hours around it.