There are 3 categories of broccoli supplements on the market:

Category 1 – supplements that contain sulforaphane glucosinolate – in other words they contain glucoraphanin, not sulforaphane!

  • Bioavailability – 10% (glucoraphanin by itself)
  • Take your pick – there are MANY


Category 2 – supplements that contain glucoraphanin and the enzyme myrosinase.

  • Bioavailability – 40% (glucoraphanin and the enzyme myrosinase in combination)
  • Avmacol


Category 3 – supplements that contain stabilized sulforaphane. This product is made in France and is not available in the United States.

  • Bioavailability – 70% (stabilized sulforaphane)
  • Prostaphane


The sulforaphane dosages that are most interesting are 30-60mg per day. These dosage levels show up often in clinical trials.

It appears to be costly to reach this dosage range through supplementation. This is the main reason why I have started growing broccoli sprouts at home; it is very inexpensive.

Warning: The most important factor in growing broccoli spouts at home is keeping the environment clean. Contamination from pathogenic bacteria can easily occur.

1 gram of fresh sprout weight yields approximately .45mg of sulforaphane. Yield also depends on seed quality, genetic background, age of the sprouts, and whether you froze them and tossed them immediately into a blender or just chewed them up.  Blending produces optimal levels.