Broccoli sprouts are concentrated sources of sulforaphane, a type of isothiocyanate. Damaging broccoli sprouts – when chewing, chopping, or freezing – triggers an enzymatic reaction in the tiny plants that produces sulforaphane.
This is a video on how to plausibly increase the sulforaphane created from the glucoraphanin in your broccoli sprouts by up to 3.5-fold, based on the results of a 2004 Phytochemistry paper entitled "Heating decreases epithiospecifier protein activity and increases sulforaphane formation in broccoli."
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