I get deliveries on pallets almost daily and MOST of them are coming from Brazil. A majority of them, unless they're really old, are heat treated which turns out is cheaper for the pallet manufacturer. I would not use the blue stained pallets, but most others are fine. Here's the way that I look at it...they're not going to be eating/chewing on them, and they do not emit harmful vapors, so you could save some money and use them. I have furniture, book shelves, and many other things that I have made in my house that I use daily. The pallets that come from Brazil are made from mahogany or other hardwoods and when you apply poly and or stain the wood is beautiful.