Avoiding toxic soil in raised garden beds

Question

My husband, bless him, bought treated wood to build me four large raised garden beds so I can plant veggies and flowers. He’s got them built when I think to ask if he used treated wood – and he did. So now I’m wondering what’s a safe wood sealant that he can put on the wood so the chemicals don’t leech into the soil? Can we use a spar varnish on the inside?
Any suggestions or advice would be most welcome.
Thank you!

Answer 1

These links will help you make decisions regarding the safety of the treated lumber.

https://extension.missouri.edu/p/G6985
https://extension.psu.edu/plants/crops/esi/treated-lumber