Unlearn Profession

From WoW: IncGamers World of Warcraft Wiki

Unlearning Professions

The Skills Tab allows you to unlearn Professions. Although it's free and you can do it as many times as you wish it's not reversible. Make a mistake and regret unlearning and you'll have to start all over again by Training as an Apprentice. All associated recipes and support skills are unlearned at the same time.

Linked from Alchemy | Herblism