The Keyingredient (found under ground), a bone (also underground), and coconut milk (milkman by his stand).
if you are doing the ruins you bring him: a bone coconut water
all you have to do is find all of the ingredients and click on the medicine man.
Shark Tooth Island
The medicine man is the person in the palm tree next to the Ancient Ruins.
Give it to the medicine man at the top of the tree.
click on the shirt then click him
All you have to do is get all of the ingedients and talk to him.
you don't but the medicine man does
You keep it until the medicine man uses it.
then you have to go to booga bay and get the grass skirt
ask sombody else on wikianswers i dont know
You are going to carry it to the medicine man who in the future will turn it in to a potion.