The formula is one part mandrake root, three parts wolfsbane, and three parts garlic. As you click the dropper, it will take up the ingredient. Click once on the mandrake and three times on each of the others.
You get the garlic from the shelf in the lab, but you have to recover some mandrake root from outside the castle (above the wall to the right of the moat), and wilt the wolfbane (use a red-hot cannonball).
(see related question)
In the vampires castle
The formula for the anti-vampirism serum on Vampire's Curse Island is one drop of mandrake root, three drops of the wilted wolfsbane, and three drops of the garlic.
the answer is vampires curse island
in poptropica
i thought it was underground
if you think so but not really
how to get out of the clifs on poptropica
We can get the key in vampires curse island with the help of the hook on the right side of it.
Finish the entire island. Don't be stupid. Work it out.
The water on vampires curse island is used later to grow the beanstalk in the armory atic.
sos island then vampires curse island. thats all i know
dun know