Answer: Plants in the genus Brassica have the compound glucoraphanin (Phase 2 enzymes). According to researchers at Johns Hopkins University, glucoraphanin levels were highly variable in broccoli samples and there was no way to tell which broccoli plants had the highest levels. About 2 tablespoons of broccoli sprouts per day will supply all the protective enzymes an adult needs. The research continues, but no additional information is available at this time.
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