PROBLEM TO BE SOLVED: To provide garlic powder having a high SAC content and good flowability and a method for producing the same, and an oral composition for preventing or reducing high-level brain fatigue.SOLUTION: A method for producing garlic powder from garlic extract is provided, including the step (A) for subjecting garlic extract to peptidase treatment and yeast fermentation. Garlic powder contains S-allyl cysteine whose content is 10 mg/g or more. An oral composition contains S-allyl cysteine as an active ingredient.SELECTED DRAWING: None

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