Your skin gets drier than the Sahara. Then itchy beyond what even qualifies as itchy. And then it cracks and hurts and ugh. So you moisturize it into oblivion. It settles down. And then, for no obvious reason whatsoever, we're back!
That's because eczema-prone skin isn't just dry skin (as you probably know by now). Underneath the flaking, redness, itching, and general misery is a feedback loop between barrier dysfunction and inflammatory immune signaling. That's why it feels so impossible to manage!
And that's what makes DIM such a breakthrough for flare-up prone skin – it interacts with the key pathways involved in that loop, all at once.
Here's your breakdown on one of the most promising ingredients eczema- and dermatitis-prone skin.
✦ What is DIM?
✦ DIM History 101
✦ Why Eczema-Prone Skin Gets Stuck in a Loop
✦ 4 Reasons DIM is A Breakthrough
✦ More Than A Thick Moisturizer
✦ What the Numbers Say About DIM
✦ Frequently Asked Questions
✦ Where You Can Find It
What is DIM?
It's broccoli. Anticlimactic, but simply the facts.
DIM (a.k.a. 3,3'-Diindolylmethane) comes from cruciferous vegetables like broccoli, kale, cabbage, cauliflower, and Brussels sprouts.
These veggies contain a precursor called indole-3-carbinol, or I3C. When I3C encounters stomach acid during digestion, it rearranges into several compounds, the predominant stable one being DIM.
SCIENTIFIC NAME
3'3 diindolymethane
WHERE IT COMES FROM
Your body's own chemical process when digesting vegetables.
WHY WE CARE
DIM isn't a one-job molecule. Researchers have studied it across inflammatory signaling, immune regulation, hormone receptors, oxidative stress, cellular differentiation, microbial behavior, and tissue repair.
That's the whole origin. It wasn't invented in a lab. It isn't a peptide with a trademark and a marine-sounding name. It's a non-toxic, natural compound that has been sitting in the scientific literature for nearly fifty years, with thousands of published papers on it.
DIM History 101: Cabbage Has Been Having a Moment for 2,000 Years
Around 160 BC, Roman statesman Cato the Elder devoted an almost comical amount of his farming manual to the medicinal uses of cabbage.
Among other things, the text describes crushing cabbage and putting it directly onto wounds, swellings, and injured skin.
Modern DIM wasn't "discovered" until later, but the Romans had the cabbage and the enthusiasm needed to be on the right track.
CATO'S DE AGRI CULTURA
Modern DIM research really took off in the 1970s, initially around dietary compounds and cancer biology. Over the following decades, researchers realized DIM interacted with far more than one pathway, including NF-κB, AhR, Nrf2, immune signaling, and cellular stress responses.
Then skin entered the picture and by the 2000s and 2010s, DIM was being studied directly in keratinocytes and skin inflammation models. In 2018, we patented DIM in cosmetics/personal care products. And in 2021, researchers published something particularly relevant for us: a study specifically examining DIM in atopic dermatitis biology.
Now we're talking.
Why Eczema-Prone Skin Gets Stuck in a Loop
Eczema-prone skin tends to get caught between rounds of barrier dysfunction and inflammatory response.
Think of your skin barrier like the weatherproofing on a house: its job is to keep the good stuff in and unwanted stuff out. When that seal gets compromised, skin loses moisture more easily while irritants and allergens have an easier time getting through.
That sets off immune and inflammatory signals (pathways like TSLP and Th2 signaling) which can then interfere with the proteins and lipids your skin needs to maintain a strong barrier.
So eczema becomes a self-reinforcing loop: the barrier gets weaker, inflammation increases, and that inflammation makes the barrier even harder to repair.
That’s why eczema-prone skin needs more than moisture alone. The barrier and the inflammatory signaling that disrupts your barrier are part of the same problem.
Barrier gets weaker → immune alarm goes off → inflammation increases → barrier gets weaker.
Congratulations! Your skin has invented the world's least enjoyable feedback loop.
And this is where DIM beats so many other options!
*This product is not intended to diagnose, treat, cure or prevent any disease.
4 Reasons Why DIM is a Breakthrough for Flare-Ups
Four things are happening with a flare-up. Your current routine only handles one and a half of them.
Every flare-up you've ever had runs on the same five mechanisms. Here they are, and here's where all your current options fall short.
1. Barrier Dysfunction
Skin is built to keep water in and everything else out. Eczema-prone skin has a leakier barrier: water escapes more easily, irritants get in more easily, and the skin becomes increasingly reactive. The proteins responsible for building that barrier (filaggrin, loricrin, and involucrin) are part of the problem.
What Big Beauty does about it: Moisturizers that replace water and lipids on the surface, and occlusives help stop them escaping. Mostly just temporary reinforcements for a barrier that's already struggling.
What DIM does instead: Shown to activate AhR, a receptor involved in keratinocyte differentiation and production of barrier proteins like filaggrin, loricrin, and involucrin. In early human topical data, DIM was also associated with decreased transepidermal water loss and increased skin hydration.*
2. The Skin's Alarm System
When eczema-prone skin senses damage or irritation, keratinocytes release immune alarm signals. One of the big ones is TSLP, which helps kick off the inflammatory immune response you can see. The skin itself starts the flare before you're staring at a full-blown red patch.
What Big Beauty does about it: Calming ingredients generally work on the irritation and redness that follow. They can make angry skin feel considerably better, but they aren't usually designed around the alarm signal itself.
What DIM does instead: In atopic dermatitis research, DIM suppressed TSLP production in keratinocytes, interfering with one of the signals involved in setting that inflammatory response in motion.*
3. Immune Imbalance
Eczema isn't just "inflammation." Specific arms of the immune system become disproportionately active (particularly Th2, with Th17 signaling also involved) while regulatory T cells help put the brakes on those responses.
What Big Beauty does about it: Not much, frankly. Cosmetic skincare can support the barrier and reduce irritation, but immune regulation is largely outside the scope of a conventional moisturizer or soothing serum.
What DIM does instead: In a preclinical atopic dermatitis model, DIM suppressed Th2 and Th17 activation while promoting regulatory T-cell differentiation — shifting several parts of the immune response at once rather than simply trying to soothe its aftermath.*
4. Unchecked Inflammation
Once inflammation gets going, it doesn't just make skin red and itchy - it can interfere with barrier function, which leaves skin more vulnerable to the next irritant and feeds the whole flare-up cycle all over again.
What Big Beauty does about it: Cica, colloidal oatmeal, glycerin, and other soothing/barrier ingredients can calm and protect irritated skin. Useful! But they generally aren't targeting the major inflammatory signaling systems underneath the flare.
What DIM does instead: DIM has been shown directly in skin models to suppress NF-κB, a major inflammatory signaling pathway, and reduce downstream inflammatory mediators including IL-6, COX-2, iNOS, and CXCL5.*
Why DIM Isn't The Same as Just Using a Thick Moisturizer
Eczema-prone skin absolutely needs lipids, hydration, and occlusion, and moisturizers do that!
But moisturizing and supporting the biology from the root causes aren't the same job.
DIM is interesting because it's connected several parts of the cycle simultaneously:
✦ Barrier signaling through AhR
✦ Keratinocyte TSLP signaling
✦ Th2 + Th17 immune pathways
✦ Regulatory T-cell differentiation
✦ NF-κB inflammatory signaling
✦ Cellular stress response through Nrf2
Half a dozen pathways for every irritated patch of skin!
And that's really the thesis behind our Root Cause Skincare™ formulas: when a visible skin problem has lots of biological drivers, it makes sense to look for ingredients that can actually engage with all of them.
What the Numbers Say on DIM
An exploratory study looked at topical DIM in 26 people with several different skin concerns, including atopic dermatitis. Here's what it found:
27.3% LESS TEWL BY WEEK 4*
TEWL (transepidermal water loss) measures how much water escapes through the skin. Lower = the barrier is doing a better job keeping water in.
72.9% MORE SKIN HYDRATION BY WEEK 8
Self-explanatory and awesome.
HYDRATION REMAINED 66.7% HIGHER AT WEEK 16
The results stayed resilient over time.
And in L'AMARUE's finished-product consumer study of 76 people with eczema-prone skin, 93% reported reduced or stopped itching, 90% reported shorter flares, and 88% reported improved quality of life.*
Frequently Asked Questions About DIM for Eczema-Prone Skin
You're not the only one wondering! Here are the answers to your burning questions.
Q: Is DIM actually studied for eczema?
A: Yes, specifically for atopic dermatitis. A peer-reviewed study found that DIM reduced erythema and edema in an atopic dermatitis mouse model, suppressed TSLP production, reduced Th2 and Th17 activity, and promoted regulatory T-cell differentiation. That's strong preclinical evidence. There is also the early human topical data on TEWL and hydration above.
Q: Is DIM a steroid?
A: Nope. Totally different molecule, totally different mechanism. DIM is a naturally occurring cruciferous-derived compound. It doesn't belong to the corticosteroid family and it doesn't mimic one.
Q: Does DIM help with itching??
A: The published DIM evidence is strongest around barrier function, inflammatory signaling, and immune regulation, rather than DIM acting directly as anti-itch ingredient.
That said, itching is heavily intertwined with barrier damage and inflammation. And in our finished-product consumer study, 93% of eczema-prone participants reported reduced or stopped itching.*
Q: Should I only use DIM when I'm having a flare?
A: One of the defining issues with eczema-prone skin is that the underlying barrier tendency doesn't magically disappear just because your skin looks calm today.
The goal of a good routine is to help keep the skin comfortable and resilient consistently, rather than waiting until it is red, itchy, and furious to suddenly start paying attention to it.
So we recommend using it consistently! Our formulas are made to work as your top-tier skincare to make this easy.
Q: Is topical DIM the same DIM that's in supplements?
A: Same molecule but a very different use! Oral DIM is taken systemically and has been studied extensively for things like hormone and estrogen metabolism. Topical DIM is being applied directly to skin, where we're interested in local skin pathways like AhR, NF-κB, TSLP, barrier function, and inflammatory signaling. Putting DIM on your skin is not the same thing as taking a DIM supplement as they have access to totally different biology.*
Where To Get DIM in Skincare
Right here at L'AMARUE is the only place you can find DIM in skincare :) Our patented Heart to Heart Complex® is the only DIM molecule on the market in beauty!
For flare-up-prone skin of all kinds, we recommend our Flare-Up Relief Kit. It has you covered from head to toe. Our Essential Cleanser is also loved for flare-up-prone skin!
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We so hope this info has been valuable, and that we can help you (or a loved one!) feel great in your skin again! Pass this article along to anyone you think might find it interesting :)
If you have any questions whatsoever about DIM, our products, or why the sky is blue, please reach out! We'd love to chat - send us an email at team@shoplamarue.com
References
Wu X, et al. 3,3'-Diindolylmethane alleviates acute atopic dermatitis by regulating T cell differentiation in a mouse model. Molecular Immunology. 2021;130:104–112. PMID: 33309306.
Kim EJ, Park H, Kim J, Park JHY. 3,3'-Diindolylmethane suppresses TPA-induced inflammation and tumor promotion in mouse skin via downregulation of inflammatory mediators. Molecular Carcinogenesis. 2010;49(7):672–683. PMID: 20564344.
Furue M, Hashimoto-Hachiya A, Tsuji G. Aryl Hydrocarbon Receptor in Atopic Dermatitis and Psoriasis. International Journal of Molecular Sciences. 2019;20(21):5424. PMID: 31683543.
Dawe HR, Di Meglio P. The Aryl Hydrocarbon Receptor (AHR): Peacekeeper of the Skin. International Journal of Molecular Sciences. 2025;26(4):1618. PMID: 40004095.
Ernst IMA, Schuemann C, Wagner AE, Rimbach G. 3,3'-Diindolylmethane but not indole-3-carbinol activates Nrf2 and induces Nrf2 target gene expression. Free Radical Research. 2011;45(8):941–949. PMID: 21615272.
WO2025097063A1.Topical DIM compositions and uses thereof. Patent application containing exploratory topical human data.
Wang TT, Schoene NW, Milner JA, et al. Indoles Derived From Glucobrassicin: Cancer Chemoprevention by Indole-3-Carbinol and 3,3'-Diindolylmethane. Frontiers in Nutrition. 2021;8:734334. PMID: 34660663.
Centofanti T, et al. Indole-3-Carbinol: Occurrence, Health-Beneficial Properties, and Cellular/Molecular Mechanisms. Annual Review of Food Science and Technology. 2023;14:347–366.
Cato the Elder.De Agri Cultura (On Agriculture), Sections 156–157.
