An onion extract which contains glutamylmethionine, quercetin and protocatechuic acid, wherein a weight ratio of the quercetin to the glutamylmethionine (quercetin/glutamylmethionine) is 0 to 0.49, and a weight ratio of the protocatechuic acid to the glutamylmethionine (protocatechuic acid/glutamylmethionine) is 0 to 1.86.
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