Potion

A Potion is a consumable item in the Golden Sun series. Like most consumable items, each party member can hold up to 30 potions in a single inventory slot. When used, a potion completely restores a single party member's Hit Points. Potions can be bought for 1000 coins and sold for 750 coins. Also, potions are considered Artifacts, meaning they can be re-purchased if sold or dropped.

Golden Sun Potions
A limitless supply of potions can be won from the Lucky Wheels and Lucky Medal Fountain minigames in Tolbi.

The Lost Age Potions
A limitless supply of potions can be won from the Lucky Wheels and Lucky Medal Fountain minigames in Contigo and Lemuria, respectively.

Dark Dawn Potions
Potions are dropped by Dark Soldiers.

Analysis
Potions are the strongest single-target HP-restoring items in the Golden Sun series, making them valuable assets near the end of a game. However, in earlier stages of a game, when party members have lower HP totals, nuts and vials can also completely restore a character's Hit Points. Also, these items are simultaneously cheaper than potions and come in an unlimited supply. As a result, potions are better off not used until the last few dungeons, when even vials may fall short of players' expectations.

Since potions are considered Artifacts, one strategy is to sell potions and use the money earned to purchase cheaper healing items that work just as well. Even vials, the most expensive non-artifact healing item, only cost 500 coins. Compared to the 750 coins players can get by selling a potion, it is possible to increase the quantity of healing items in the party's inventory this way, assuming quality isn't an issue. Then near the end of the game, when a player has excess money (most likely due to powerful weapon and armor Artifacts, making old equipment obsolete while also reducing the need to buy new equipment), the potions can safely be repurchased.