AFAIK, most of the ingredients from Macbeth's witches potion are not literally animal parts - e.g. Adder's Fork is not the tongue of an adder, but a leaf from the Adder's Fork plant. similarly, eye of newt is mustard seed, etc. We did it in english lit at school, but here is a modern web page stating similar:

Slytherinmediwitch (talk) 09:51, October 19, 2019 (UTC)

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