- I'ver never heard anything about aspen being dangerous, but I know it's
bark contains a known anticoagulant that has been linked to an
encephalitis-like illness in children. They call it aspirin.
OK, that bit of smartassedness out of the way I have never heard of
toxicity issues with any of the common domestic (North American)
hardwoods, but will also admit that aspen hovers on the edge of what
I'd call a common domestic hardwood. People have been chewing the bark
for centuries as an analgesic, which implies to me that the trace
amounts you are going to get from incidental contact are probably
nothing to worry about.
Here are a couple of links. Aspen doesn't make the cut on either one
so I suspect you are fine. (Black walnut, on the other hand....
Nevery heard that before, particularly not from the place selling
walnut bowls in central Missouri.)