Sulforaphane

Evidence Anchor

BioHarmony 6.8/10

The practical verdict on sulforaphane is that it is a reasonable food-level intervention for cruciferous vegetable enthusiasts and a selective supplement for metabolic-health and pollutant-detoxification use cases. It is not the broad-spectrum NRF2 panacea the marketing suggests. The score lands at 6.8 / 10 (Neutral) because the Egner 2014 Qidong detox signal and the Axelsson 2017 glycemic signal are real but several broad disease trials in COPD, pneumonia, prediabetes, prostate cancer, and breast cancer have been mixed or negative. Sulforaphane scores below most well-established metabolic interventions and most NRF2-adjacent tools that have made it to clinical translation. It is meaningfully different from a snake-oil supplement in that the core mechanism is real and reproducible; what holds it back is the gap between what the molecule does in cells and what it has been shown to do in adequately powered human disease trials. ✅ Best for: People with elevated air pollution exposure or dysregulated fasting glucose who can source a glucoraphanin product paired with active myrosinase (Mastaloudis 2026) and will track fasting glucose or hs-CRP for 8 to 12 weeks; obese type 2 diabetes patients in the dysregulated subgroup who have read Axelsson 2017 and accept the small effect size; cruciferous vegetable enthusiasts who want a food-first NRF2 activator and are willing to grow broccoli sprouts at home for cents per dose; users with intact GSTM1 or GSTT1 genotype and a documented gut microbiome conversion capacity who want to test responder status; readers willing to base a supplement trial on objective markers (fasting glucose, HbA1c, hs-CRP, ALT and AST) rather than subjective detox claims. ❌ Avoid if: You are pregnant, breastfeeding, or planning conception with concentrated extracts (food-level cruciferous intake is fine); you are in active chemotherapy, radiation, or hormone-sensitive cancer treatment without oncology approval; you have a history of severe GI sensitivity to brassicas or sulfur compounds; you are on warfarin or other anticoagulants without clinician review; you have severe thyroid disease combined with iodine deficiency and very high raw cruciferous intake; you are buying a glucoraphanin only product without active myrosinase and not relying on gut microbial conversion (exposure will be variable and low); you are looking for a broad-spectrum NRF2 cure-all rather than a selective intervention with subgroup-dependent effects; you are spending opportunity-cost dollars or attention here that would generate larger returns from sleep, training, GLP-1 agonists, smoking cessation, or basic dietary improvements.

Read the full BioHarmony report

My score and my verdict: one signal of three, never the whole answer.