SGS-Rich BroccoSprouts(R) Researchers at Johns Hopkins University School of Medicine, who first isolated sulforaphane from broccoli in 1992, found that young broccoli sprouts, in particular, contained concentrations of SGS that were 20 to 50 times greater than those found in adult cooked broccoli. These broccoli sprouts are now available to consumers as BroccoSprouts(R). One ounce of BroccoSprouts has the same amount of SGS as 1-1/4 pounds (20 ounces) of mature, cooked broccoli.