I just don't know I'm sorry. I've also heard it's an issue, but I don't know how to go about finding produce that's particularly good or bad in that regard.

I'd guess a concentrated product that's developed specifically for detoxification, such as those linked below, may be free from toxicity. But this is a suggestion, not advice; I always recommend seeing a professional before taking these kinds of supplements.

https://iherb.com/pr/bioray-ndf-plus-gentle-heavy-metal-deto...

https://iherb.com/pr/planetary-herbals-cilantro-heavy-metal-...