The restoring booster is an injection Artemis Fowl (II)  gave to a drunken Faily Healer at the beginning of Artemis Fowl (Novel), which comined with a vial of spring water was used to bargain for a look at The Book.

He describes it as "a little shot of man-made magic. A virus that feeds on alcohol, mixed with a growth agent. It will flush every drop of rice wine from your body, remove the dependance, and even bolster your failing liver." He also tells her that it will be a painful experience.

We later find out that the restoring booster was mixed with an amnesiac which caused the sprite to forget the preceding week.

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