You cannot learn the nourishing potion formula again if you have not learned it after completing the task, because this nourishing potion formula task was learned after completing the "Materials of the Desolate Land" task given by the alchemist of Thelsama. The mission is unique. Moreover, learning the formula of nourishing potion requires reaching the level of Alchemy 210, and the game player character must reach level 40 or above. Therefore, if you have not learned the formula of nourishing potion after completing the task, there is no way to learn it again.

Data expansion: "World of Warcraft" is an online game created by Blizzard Entertainment. The task of formulating the nourishing potion is one of the tasks in this game. Tonic Elixir can dispel a curse, disease, or poison from a gamer, and lasts for half a minute once used.