To provide an oral composition showing excellent antiobestic effect and muscle enhancement effect.SOLUTION: An oral composition contains 3-hydroxy-3-methylbutyric acid or a salt thereof, and at least one other materials selected from ceramide, kudzu flowers, Polygonum sachalinense, Kotsusaiho (a herbal medicine prepared from a rhizome of Drynaria fortunei), Ajuga decumbens, and capsicum.SELECTED DRAWING: Figure 1

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