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Consuming sulforaphane in amounts found in cruciferous vegetables is considered safe with few — if any — side effects. Additionally, sulforaphane supplements are available for purchase at health food stores and online retailers. These supplements are typically made from broccoli or broccoli sprout extract and generally concentrated, containing more sulforaphane than what’s naturally found in food.
Glucoraphanin — the precursor to sulforaphane — supplements are also available combined with myrosinase for activation. These are marketed as a way of increasing sulforaphane production in your body.
While there are no daily intake recommendations for sulforaphane, most available supplement brands suggest taking around 400 mcg per day — typically equalling 1–2 capsules.
Mild side effects have been associated with sulforaphane supplements, such as an increase in gas, constipation, and diarrhea.
Despite their growing popularity, more research is needed to determine the ideal dose, safety, and effectiveness of sulforaphane supplements in humans. *
