Yes, it’s toxic. DO NOT feed any to a dog or horse —it will almost surely kill them, as they are MUCH more sensitive to it.
There are some who say you should not take husk or wormwood everyday for more than 3 months, and I am one of them.
Eh...I think that is why I heard they no longer permit the importation of some types of Absinthe, which gets it’s green tincture from Wormwood, which technically IS toxic.
But I mean line ANY of these up against your standard “legit” Rx antifungal medication and they’re pussycats (but they work).
Black Walnut trees tend to kill the surrounding grass well.
Strung enough to protect the nut inside from everything.