Section
Sulforaphane supplements
Most products on the shelf do not contain sulforaphane at all. Understanding what they do contain is most of the work.
Quick answer
Most sulforaphane supplements contain glucoraphanin from broccoli seed or sprout extract, not sulforaphane. Whether that becomes sulforaphane in the body depends on whether the product also supplies active myrosinase, and on gut bacteria, which vary enormously between people. This is why two products with identical label amounts can deliver very different results.
Sulforaphane is unstable, which is why very few products contain it directly. The common approach is to supply glucoraphanin and rely on conversion, either from added myrosinase or from the enzyme activity of gut bacteria.
This section is informational. There are no affiliate links on this site and no product is sold here. Pages cover what the different preparations are, what the label terms mean, and which comparisons between products are meaningful.
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This page describes published research. It is general information, not medical advice, and it is not a recommendation to take anything. Sulforaphane and cruciferous-vegetable supplements can interact with medication. Talk to a doctor or pharmacist before starting a supplement, particularly if you are pregnant, breastfeeding, on anticoagulants, or being treated for thyroid disease.