Broccoli Seed ExtractSulforaphane glucosinolate (SGS) is a natural substance extracted from the seeds and sprouts of select broccoli varietals. It is an indirect antioxidant that provides long lasting cell protection from free radical damage.* Typical antioxidants, such as vitamin C, vitamin E, and beta carotene, work "directly" to neutralize free radicals and are usually effective for only approximately three hours after ingestion.* When Thorne's Crucera SGS is ingested