Iberin for Health & Longevity - Quick Reference Sheet
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Iberin for Health & Longevity

Created on 07/10/2026 – Quick Reference based on Evidence Review created using AI4L / Opus 4.8 – Audit

Iberin is a minor sulfur compound released from cruciferous vegetables like broccoli, cabbage, and horseradish, and a close relative of sulforaphane. Laboratory work shows it switches on antioxidant and detoxification defenses, slows cancer cell growth, and calms inflammation. No human trials exist. Best obtained from whole foods rather than concentrated extracts. (Full Review)

Protocol

Source
Whole cruciferous vegetables
Broccoli, cabbage, Brussels sprouts, horseradish, sprouts; no validated standalone iberin protocol exists
Preparation
Raw or lightly steamed
Thorough cooking inactivates myrosinase; add active mustard-seed powder to cooked vegetables to preserve conversion
Frequency
Divided across meals
Short duration of action favors intake at more than one meal over a single large dose
Time to effect
Antioxidant defenses
Hours to 1–2 days
Cellular antioxidant-enzyme induction begins at this timescale
Clinical benefit
Not established
No health outcome demonstrated in people; measured as a sustained dietary pattern

Benefits

Contraindications
  • Poorly controlled thyroid disease with iodine deficiency
  • Pregnancy and breastfeeding
  • Active gastrointestinal ulceration
    •
Key Interactions
  • Thyroid hormone replacement (levothyroxine)
  • Anticoagulant and antiplatelet drugs (warfarin)
  • Cytochrome P450 substrates and phase II-metabolized drugs (acetaminophen)
  • Over-the-counter analgesics and antacids
  • Other Nrf2-activating supplements (sulforaphane, curcumin, resveratrol)
  • N-acetylcysteine and high-dose antioxidant thiols
    •

Risk & Side Effects

  • Medium: Thyroid suppression at high intake
    •
  • Low: Gastrointestinal irritation; pro-oxidant cytotoxicity at high concentrations
    •
  • Speculative: Drug-metabolizing enzyme modulation; reproductive and developmental uncertainty
    •

Monitoring

Marker Target Why
TSH 0.5–2.0 mIU/L Detects goitrogenic thyroid suppression from high intake
Free T4 1.0–1.5 ng/dL Confirms thyroid hormone output if TSH shifts
hs-CRP < 1.0 mg/L Tracks the inflammatory status iberin theoretically modulates
eGFR > 90 mL/min/1.73m² Contextualizes the isolated preclinical renal signal

Cadence: Baseline before elevated intake; ~8–12 weeks after a sustained change, then every 6–12 months (more frequent thyroid checks with pre-existing thyroid disease)

Qualitative Assessment

  • Digestive comfort — absence of nausea, heartburn, or abdominal discomfort with intake
  • Energy levels and general vitality over sustained intake
  • Absence of thyroid-related symptoms such as unexplained fatigue, cold intolerance, or neck swelling
  • Subjective tolerance when intake is increased, used to guide gradual titration
Not medical advice. Educational distillation of a single evidence review. Confirm any decision with a qualified clinician, especially in the presence of prescription drugs or chronic conditions.