You can never have too many Healing Potions in Baldur’s Gate 3. Unfortunately, the basic potions can only get you so far, so sooner or later you’ll have to start stocking up on Potions of Greater Healing. These heal twice as much as the regular variant while also removing the Burning status effect.
Baldur’s Gate 3: How To Learn The Potion Of Greater Healing Recipe
Make sure to stock up on Potions of Greater Healing before engaging in a big fight.