"The Blue Medicine is the most expensive, but a very good buy."
The Blue Potion is an elixir commonly found throughout the Zelda franchise. Its uses vary, but commonly include the replenishment of health and magic. This potion is typically one of the most expensive potions in any game it can be found in due to its convenient restoration properties.
The Wind Waker
After Link brings 15 blue chu jellies (there are only 23 blue ChuChus in the game) to Doc Bandam at the Chu Jelly Juice Shop on Windfall Island, he will make the Blue Potion. From then on you can buy the potion for 60 rupees.