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I3C4.5
Indole-3-Carbinol Research
Likely helps
48 peer-reviewed studies
What the evidence says
Likely helps
Indole-3-Carbinol appears to help in 3 of 3 studies with measurable effects — the evidence leans clearly favourable.
Most evidence is from high-quality meta-analyses and randomised trials published 1997–2026 with a typical study size of 57 participants.
Based on 48 studies · 2 meta-analyses · 10 RCTs · 2,306 total participants
Confidence
High confidence
What the studies found
3helped· 45 more without graded effect data
By outcome
Therapeutic & clinical
Mostly mechanism / observational30 studies
Women's healthSmall RCTs show a favorable shift in the 2-OH:16α-OH estrogen ratio (surrogate biomarker) · 4-8 weeks · Plausible via estrogen metabolism; no PMS-specific trials · 1-3 cycles · No menopause-specific evidence for I3C; mechanism only · 4-8 weeks
Likely helps13 studies
Liver healthInduces phase I/II detox enzymes; clinical liver outcomes not established · 4-12 weeks
Mostly mechanism / observational6 studies
Safety profile
Mostly mechanism / observational6 studies
InflammationAnti-inflammatory signaling preclinical only; no human outcome data · 2-4 weeks
Mostly mechanism / observational3 studies
Glucose & metabolic
Too few graded studies1 study
By the numbers
Pulled from 29 studies with measurable effects
Likely real effects
100%
across studies
People studied
2,306
typical study: 57 people
Strongest designs
12
2 pooled, 10 randomised
Showed benefit
100%
3/3 studies
How long studies ran
1–3 months
2
3+ months
3
Populations Studied
Cancer patients4
Women3
Breast cancer patients2
In vitro and in vivo models1
Active research area
30 studies in the last 5 years · Latest meta-analysis: 2024
199720112026
1Breast cancer risk reductionSystematic ReviewCited 5×2025
Integrating cruciferous vegetables and their bioactive compounds in light of an individual's microbiome profile as a complementary approach alongside standard treatments is a promising strategy in breast cancer care.
Ho E et al. · Annual review of nutrition (2025)
Breast cancer is a heterogeneous disease with varying subtypes, prognoses, and treatment responses.
Cruciferous vegetables have shown promise in reducing breast cancer risk.
Integrating cruciferous vegetables and their bioactive compounds in light of an individual's microbiome profile as a complementary approach alongside standard treatments is a promising strategy in breast cancer care.
Thus, I3C prevents the toxicities caused by chemicals in the surrounding environment as well as those of consumed drugs.
Gerges MN et al. · Journal of biochemical and molecular toxicology (2025)
Moreover, it reduces fetal malformation and protects against micronuclei formation and calstogenecity induced by cyclophosphamide (CP) in bone marrow cells.
It also attenuates methotrexate (MTX)-induced hepatotoxicity, mitigates neurotoxicity caused by thioacetamide and clonidine, and protects against aspirin side effects in gastric mucosa.
Furthermore, its nanoparticles inhibit neuronal damage caused by glutamate and rotenone.
3Prevention and treatment of chronic diseases including inflammation, obesity, diabetes, cardiovascular disease, cancer, hypertension, neurodegenerative diseases, and osteoporosisSystematic ReviewCited 29×2023
This article reviews current knowledge of the occurrence of I3C in nature and foods, along with the beneficial effects of I3C and DIM concerning prevention and treatment of human chronic diseases, focusing on preclinical studies and their mechanisms of action at cellular and molecular levels.
Amarakoon D et al. · Annual review of food science and technology (2023)
One of its main in vivo metabolites is 3,3'-diindolylmethane (DIM), formed by the condensation of two molecules of I3C.
Both I3C and DIM alter multiple signaling pathways and related molecules controlling diverse cellular events, including oxidation, inflammation, proliferation, differentiation, apoptosis, angiogenesis, and immunity.
There is a growing body of evidence from both in vitro and in vivo models that these compounds possess strong potential to prevent several forms of chronic disease such as inflammation, obesity, diabetes, cardiovascular disease, cancer, hypertension, neurodegenerative diseases, and osteoporosis.
4Liver disease treatment through modulation of cell proliferation, apoptosis, oxidative stress, and lipogenesisSystematic ReviewCited 3×2024
Mechanistically, I3C and DIM modulate various pathophysiological processes, including cell proliferation, apoptosis, oxidative stress, and lipogenesis.
Tian C et al. · Biomedicine & pharmacotherapy = Biomedecine & pharmacotherapie (2024)
Mechanistically, I3C and DIM modulate various pathophysiological processes, including cell proliferation, apoptosis, oxidative stress, and lipogenesis.
This review aims to enhance researchers' understanding of the regulatory roles of I3C and DIM in these liver diseases and explore the potential of plant-derived substances in liver disease treatment.
Instead, they indicate that including brassica vegetables in the daily diet, particularly when accompanied by adequate iodine intake, poses no adverse effects on thyroid function.
Galanty A et al. · International journal of molecular sciences (2024)
We analyzed the results of 123 articles of in vitro, animal, and human studies, describing the impact of brassica plants and extracts on thyroid mass and histology, blood levels of TSH, T3, T4, iodine uptake, and the effect on thyroid cancer cells.
We also presented the mechanisms of the goitrogenic potential of GLSs and ITCs, the limitations of the studies included, as well as further research directions.
The vast majority of the results cast doubt on previous assumptions claiming that brassica plants have antithyroid effects in humans.
Importantly, WWP1 inhibition using small molecule inhibitors such as Indole-3-Carbinol (I3C) and Bortezomib or siRNAs leads to significant suppression of cancer growth and healing of bone fractures, suggesting that WWP1 might serve as a potential therapeutic target for several diseases.
Behera A et al. · Cell death & disease (2023)
In this review, we discuss the evolutionary perspective, structure, and functions of WWP1 and its multilevel regulation by various regulators.
We also examine its emerging roles in cancer progression and its therapeutic potential.
Finally, we highlight WWP1's role in normal physiology, contribution to pathological conditions, and therapeutic potential for cancer and other diseases.
Karimabad MN et al. · Mini reviews in medicinal chemistry (2023)
Furthermore, 75 to 80% of the global population use herbal remedies as primary therapy, mainly because of their better efficiency and satisfaction, which elevate the human body symmetry with the minimum unwanted adverse effects.
For the control of cancer, plant products, and fruits have been considered promising tools and are being consumed for centuries.
Several plant extracts are also being used for the therapy and prevention of different types of known cancers.
8Inflammatory bowel disease protection through Th17/Treg balance regulationSystematic ReviewCited 70×2021
Recently, a growing body of studies has indicated that phytochemicals derived from natural products are potent regulators of Th17/Treg, and exert preferable protective benefits against colonic infl...
Chang Y et al. · Biomedicine & pharmacotherapy = Biomedecine & pharmacotherapie (2021)
Recently, a growing body of studies has indicated that phytochemicals derived from natural products are potent regulators of Th17/Treg, and exert preferable protective benefits against colonic inflammation.
9Colorectal cancer growthSystematic ReviewCited 115×2022
Additionally, extensive molecular interactions between tryptophan metabolites and intracellular signaling pathways will be thoroughly discussed.
Ala M · International reviews of immunology (2022)
Serotonin system also increases colorectal cancer cells proliferation and metastasis while, indole metabolites can profoundly decrease colorectal cancer growth.
Furthermore, it will be explained how indole metabolites supplementation, inhibition of indoleamine 2,3-dioxygenase 1 (IDO1), KMO and serotonin receptors can protect against colorectal cancer.
Additionally, extensive molecular interactions between tryptophan metabolites and intracellular signaling pathways will be thoroughly discussed.
10Tumorigenesis and cancer susceptibilitySystematic ReviewCited 24×2022
In turn this unfolding regulatory network is allowing for the identification of genes directly involved in both tumorigenesis at large and cancer susceptibility syndromes.
Song MS et al. · Seminars in cancer biology (2022)
In turn this unfolding regulatory network is allowing for the identification of genes directly involved in both tumorigenesis at large and cancer susceptibility syndromes.
While the complexity of this regulatory network is still being unraveled, these new findings are paving the way for novel therapeutic modalities for cancer prevention and therapy as well as for other diseases.
Here we will review the signal transduction and therapeutic implications of the cross-talk between HECT family members and PTEN.
Phytochemicals, including indole-3-carbinol (I3C) and its metabolite, diindolylmethane (DIM), exhibit neuroprotective effects through BDNF's mimetic activity; Akt phosphorylation is induced, and the antioxidant defense mechanism is activated by blocking the Nrf2-kelch-like ECH-associated protein 1 (Keap1) complex.
Singh AA, Yadav D, Khan F, Song M · Brain Sciences (2024)
I3C activates the aryl hydrocarbon receptor pathway with broad anti-inflammatory effects
Neuroprotective effects demonstrated in multiple neurodegeneration models
DIM (the primary metabolite) shows enhanced bioavailability and potency compared to I3C
Therefore, a supplement that contains these micronutrients, using the safest form and dosage should be investigated in future breast cancer chemoprevention studies and as part of standard breast ca...
Mokbel K et al. · In vivo (Athens, Greece) (2019)
Therefore, a supplement that contains these micronutrients, using the safest form and dosage should be investigated in future breast cancer chemoprevention studies and as part of standard breast cancer therapy.
14I3C and DIM role in chronic disease preventionSystematic ReviewCited 30×2016
This chapter summarizes the current experimental data on the I3C and DIM activity and the results of clinical studies indicating their role in prevention of chronic diseases.
Licznerska B et al. · Advances in experimental medicine and biology (2016)
Initially, these compounds were classified as blocking agents that increase drug-metabolizing enzyme activity.
Now it is widely accepted that I3C and DIM affect multiple signaling pathways and target molecules controlling cell division, apoptosis, or angiogenesis deregulated in cancer cells.
Although most of the current data support the role of I3C and DIM in prevention of hormone-dependent cancers, it seems that their application in prevention of the other cancer as well as cardiovascular disease, obesity, and diabetes reduction is also possible.
Some degree of the cytotoxic and proapoptotic effects of indole-3-carbinol on colon cancer cells is dependent on activation of the aryl hydrocarbon receptor.
Megna BW et al. · The Journal of surgical research (2016)
Some degree of the cytotoxic and proapoptotic effects of indole-3-carbinol on colon cancer cells is dependent on activation of the aryl hydrocarbon receptor.
This represents a novel mechanism for the molecular action of indole-3-carbinol and enhances our understanding of its effects in the context of colorectal cancer.
Continued preclinical study of both indole-3-carbinol and the aryl hydrocarbon receptor pathway is warranted, which may one day lead to novel diet-derived colon cancer treatments that enlist the AHR.
18Cancer prevention potential of glucosinolatesReview2026
The described compounds are bioavailable in humans and modulate the clinically relevant pathways linked to carcinogenesis.
Labudda M et al. · Nutrients (2026)
The described compounds are bioavailable in humans and modulate the clinically relevant pathways linked to carcinogenesis.
Larger, standardized interventions are needed to determine effective intake levels, optimize bioavailability, and define their potential role in evidence-based nutritional strategies for cancer prevention.
Further more extensive studies are necessary to discover the effective mechanism of these natural compounds as anti-HPV agents.
Hosseini MS, Sadeqi A, Heidari Z, Boozari M. · Phytotherapy research : PTR (2025)
In addition, carrageenan shows promising effects in HPV transmission prevention.
It appears that compounds from nature may have an impact, on different phases of the HPV infection like genital warts treatment, disease transmission prevention, and healing-related cancers.
These findings highlight the potential of natural products as valuable sources to combat HPV infection and related cancers.
In conclusion, GSLs and their derivatives offer significant potential as both chemopreventive and therapeutic agents, warranting further clinical investigation to optimize their application in cancer treatment.
Joković N, Pešić S, Vitorović J, Bogdanović A, Sharifi-Rad J, Calina D. · Phytotherapy research : PTR (2025)
These compounds have demonstrated good bioavailability, low toxicity, and minimal adverse effects, supporting their potential therapeutic application.
Their anticancer mechanisms include the modulation of reactive oxygen species, suppression of cancer-related signaling pathways, and direct interaction with tumor cell proteins.
Additionally, semi-synthetic derivatives of GSLs have been developed to enhance anticancer efficacy.