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Phenethyl isothiocyanate (PEITC) is a dietary isothiocyanate released from the glucosinolate gluconasturtiin in cruciferous vegetables such as watercress. It activates the Nrf2 antioxidant pathway, induces phase II detoxification enzymes and is studied as a cancer chemopreventive phytochemical.
- Activates Nrf2 and boosts cellular antioxidant defenses
- Induces phase II detoxification enzymes that clear carcinogens
- Anti-inflammatory via NF-kB suppression
- Chemopreventive activity across multiple preclinical cancer models
- Protects against oxidative organ injury in animal studies
- High doses can irritate the gastrointestinal tract and mucosa
- At high concentrations isothiocyanates can be pro-oxidant or genotoxic
- May interact with drug-metabolizing enzymes
Overview
Phenethyl isothiocyanate is one of the most studied dietary isothiocyanates. It is generated when the glucosinolate gluconasturtiin in crucifers such as watercress is hydrolyzed by the plant enzyme myrosinase or by gut microbiota. Its chemoprevention profile is anchored in two complementary actions: activation of the Nrf2/Keap1 pathway, which upregulates a broad antioxidant and phase II detoxification program, and suppression of pro-inflammatory NF-kB signaling. Mechanistic and animal work supports carcinogen detoxification and anti-inflammatory activity as core to its effects. In an azoxymethane/dextran sodium sulfate model of colon tumorigenesis, PEITC reduced tumor formation, illustrating in vivo chemopreventive efficacy.
Beyond cancer, its Nrf2-activating capacity translates into organ protection: PEITC guarded against cyclophosphamide-induced nephrotoxicity in rats through the Nrf2 pathway. Comparative reviews place PEITC alongside sulforaphane and indole-3-carbinol as leading crucifer-derived chemopreventive agents, sharing anti-oxidative, anti-inflammatory and epigenetic mechanisms. Because isothiocyanates and their N-acetylcysteine metabolites concentrate in the urinary tract, much of the human-relevant work focuses on the bladder. As with all isothiocyanates, benefit is concentration-dependent and very high exposures can shift from protective to irritant or pro-oxidant, so dietary and modest supplemental intake is the relevant context.
- Watercress is one of the richest dietary sources of PEITC.
- PEITC and its metabolites concentrate in the urinary tract, which is why much of its cancer research targets the bladder.
- It is only released when cruciferous plant tissue is chewed or chopped and myrosinase acts on gluconasturtiin.
Mechanism
PEITC activates Nrf2 by modifying cysteine residues on its repressor Keap1, driving transcription of antioxidant and phase II detoxification enzymes that neutralize and clear carcinogens. It concurrently inhibits NF-kB-driven inflammation and can modulate cell-cycle and apoptotic pathways in transformed cells.
receptor fingerprint
Nrf2/Keap1 pathwayactivator
Phase II detoxification enzymesinducer
NF-kB signalinginhibitor
Dosingtypical ranges, not medical advice
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Safetyrisks and cautions, not medical advice
At dietary and modest supplemental levels PEITC is generally well tolerated. High concentrations can irritate gastrointestinal and mucosal tissue, and isothiocyanates can become pro-oxidant or genotoxic at supraphysiologic doses. It may interact with drug-metabolizing enzymes, and human clinical efficacy for disease prevention is not established.
History
PEITC has been investigated for decades as the principal isothiocyanate of watercress, and is a frequent comparator in dietary cancer-prevention research.
Reputation
It is regarded as a promising food-derived chemopreventive compound and a staple of nutritional biochemistry research, especially for bladder and lung cancer models.
Subjective profileweighing the evidence above
Eat the watercress. The Nrf2 and phase II detox biology is real and the preclinical cancer work is interesting, but human clinical efficacy is not established, and high concentrations turn pro-oxidant and irritate the gut. Diet is the sensible dose here.
Resources
This entry is here for reference.
Research
- 2010first citedMolecular targets of dietary phenethyl isothiocyanate and sulforaphane for cancer chemopreventi…
- 2023most recentPhenethyl isothiocyanate protects against cyclophosphamide-induced nephrotoxicity via nuclear f…
- 1.Molecular targets of dietary phenethyl isothiocyanate and sulforaphane for cancer chemoprevention
- 2.Dietary Glucosinolates Sulforaphane, Phenethyl Isothiocyanate, Indole-3-Carbinol/3,3'-Diindolylmethane: Anti-Oxidative Stress/Inflammation, Nrf2, Epigenetics/Epigenomics and In Vivo Cancer Chemopreventive Efficacy.
- 3.Phenethyl isothiocyanate protects against cyclophosphamide-induced nephrotoxicity via nuclear factor E2-related factor 2 pathway in rats
- 4.Differential in vivo mechanism of chemoprevention of tumor formation in azoxymethane/dextran sodium sulfate mice by PEITC and DBM
4 listed here; entry last updated August 2026
Reviews
My notesprivate to this device
FAQ
Where does PEITC come from?
It is released from the glucosinolate gluconasturtiin in cruciferous vegetables, with watercress a leading source.
How does it help detoxify carcinogens?
It activates Nrf2, which switches on phase II enzymes that conjugate and clear reactive carcinogens.
Do I need to eat crucifers raw?
Raw crucifers retain myrosinase for conversion; cooking can reduce it, though gut bacteria provide partial conversion.
Is more always better?
No. Benefit is concentration-dependent and very high intake can become irritant or pro-oxidant.
Is PEITC a proven cancer treatment?
No. Evidence is largely preclinical and mechanistic; it is studied for prevention, not established as therapy.
Adverse effects
- High doses can irritate the gastrointestinal tract and mucosa
- At high concentrations isothiocyanates can be pro-oxidant or genotoxic
- May interact with drug-metabolizing enzymes
Notes and cautions
- Human clinical efficacy is not established