Sulforaphane, an isothiocyanate compound, is the most potent naturally occurring inducer of the body's key detoxification enzymes. While sulforaphane is derived naturally from a variety of cruciferous vegetables such as Brussels sprouts, kale, and mustard greens, with the highest quantities available from broccoli sprouts, it is also widely available as a dietary supplement. Although many supplement manufacturers do not take steps to preserve the integrity of their products and some have made misleading claims about their products' efficacy, a few reputable manufacturers produce quality supplements that have been used in clinical trials.