Would be cheaper and better to allow the use of x2 mystery tonic (either forest or furniture) with the 2 other ingredients to be used in the mystic forge to make account bound tonics.
For example, it costs around 60 silver to make the mystery tonic beast. This yields 5 beast mystery tonics which can be used in the mystic forge to make other account bound tonics (such as krait). (x2 beast mystery tonic, Tiny Fang, Tiny Scale).
The recipe would greatly be enhanced if the recipes allowed the cheaper versions of the mystery tonics to take the place of the beast ones (nearly half the cost).