The USDA has said that every part of a buckeye tree, from the leaves to the bark and the nut, is toxic. If someone were to ingest any part of the tree, they would experience "muscle weakness and ...

Some sources say that the buckeye nuts can be leached to remove the tannin, but, hmm. Maybe not. Along those lines, The Texas A&M Forest Service states that “the powdered bark was once used for ...