From the Super Mario Wiki
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In Wario Land: Super Mario Land 3 and Virtual Boy Wario Land, a type of Garlic power-up called the Garlic Bottle appears. It turns Small Wario into normal Wario, and normal Wario into Bull Wario. In Wario Land 3, Garlic is one of the treasures that Wario has to collect. Once found in the Tower of Revival, after Wario opens the Blue Snake door, it will confer him the ability to break solid blocks. Also in Wario Land 3, bunches of garlic can be seen hanging from some platforms in Forest of Fear; if Wario transforms into a vampire and touches a bunch of garlic, he instantly reverts to his regular form.
In WarioWare: Touched!, Wario eats a Nasty Garlic in Wario-Man's intro cutscene and transforms into Wario-Man. After the microgames are beaten for the first time, the Nasty Garlic will then appear on the main selection screen so that Wario can turn back into Wario-Man at any time.
In Wario Land: Shake It! Garlic makes a reappearance. Garlic can be obtained by shaking enemies and heal one heart of Wario's life meter. Occasionally, an enemy releases a big Garlic, which heals three hearts of Wario's life meter.