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There is a Chizpurfle carapace which is typically used in anti-poisons. This works to counter the affect of the aconite, and the other poisons in the potion. The Mandrake root is also used in anti-poisons.
Finally there is the Sophorous bean, which provides a calming affect on the wolf.
For obvious reasons without the anti-poison ingredients the potion is not going to be anything that anyone would wish to consume. The Sophorous bean works in conjunction with the aconite to help calm the wolf during the full. The Aconite actually poisons the wolf - the Sophorous bean calms it so it does not fight so much.