Sulforaphane is a naturally occurring sulfur-containing isothiocyanate derivative that is hydrolyzed from its precursor when plant tissues are crushed or chewed. Soon after ingestion, the phytochemical begins to act within the body, triggering an immune system response to carcinogens. More specifically, sulforaphane induces a series of proteins known as phase 2 detoxification enzymes to scavenge for carcinogenic substances before they are able to promote cancer. Unlike many vitamins, however, the effects of the indirect oxidant may be experienced by cells throughout the entire body and may persist for several days.