Définition
Sulforaphane is a sulfur-containing compound concentrated in broccoli sprouts. It is one of the most potent natural Nrf2 activators known, upregulating the body's endogenous antioxidant defenses, supporting phase II detoxification, and inducing phase I detox enzymes including CYP1A1 that metabolize estrogens toward more favorable pathways.
Sulforaphane is produced when the precursor glucoraphanin (found in cruciferous vegetables) meets the enzyme myrosinase. Both are present in broccoli, kale, and other Brassica vegetables, but they are stored in separate compartments until the tissue is damaged — by chewing, chopping, or cooking. Heat destroys myrosinase, which is why raw or briefly steamed cruciferous vegetables produce more sulforaphane than thoroughly cooked ones.
Broccoli sprouts are the densest natural source — they contain 50–100 times more glucoraphanin per gram than mature broccoli. Three-day-old broccoli sprouts, grown from high-glucoraphanin seed varieties, are the most practical whole-food source.
Sulforaphane's biological activity is dominated by Nrf2 activation. It modifies cysteine residues on KEAP1 (Nrf2's inhibitor), releasing Nrf2 to activate hundreds of antioxidant and detox genes. Downstream effects include increased glutathione synthesis, enhanced phase II detoxification, reduced inflammatory markers (hs-CRP, IL-6), and activation of heat shock proteins. Sulforaphane also modestly induces autophagy.
Of particular relevance to women: sulforaphane activates CYP1A1, the phase I enzyme that preferentially metabolizes estrogens through the 2-hydroxy pathway — producing 2-hydroxyestrone, which is considered a more favorable estrogen metabolite than 16-alpha-hydroxyestrone. This makes cruciferous vegetables and sulforaphane part of many estrogen-support protocols.
Practical dosing: a handful of fresh broccoli sprouts daily, or a supplement providing 10–40mg of sulforaphane (look for products that specify sulforaphane content rather than just glucoraphanin, and that include active myrosinase). Adding a small amount of mustard powder or daikon radish to cooked broccoli can restore myrosinase activity.
Termes associés
Ava Longevity · Built on the Ava Method · MMXXV