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Healthy Skin Starts in the Gut

A stronger gut barrier means fewer flares

Gut Barrier Eczema Relief System (Ages: 12+)

9% Off
Regular price $159 $144
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This 30-day inside & out advanced 30-day system is designed to strengthen both weak gut and skin barriers for real eczema relief.

The prebiotic + probiotic supplement duo works from within, supporting digestion, balancing your gut microbiome, and increasing skin ceramide production for healthier skin. Think of it as one of the best probiotics for skin and gut health, helping reduce flares before they start.

On the outside, our soap and lotion for eczema calms itch, deeply hydrates, helps shed dead skin, and restores your skin barrier. Together, it’s the perfect connection between gut health and skin wellness.

Real Codex Customers

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What's Included

BIA ClearSkin Synbiotic Supplement for Eczema-Prone Skin

BIA ClearSkin Synbiotic Supplement for Eczema-Prone Skin

BIA Eczema Relief Lotion

BIA Eczema Relief Lotion

BIA GutBuilder Prebiotic Supplement (Kids + Adults)

BIA GutBuilder Prebiotic Supplement (Kids + Adults)

Bar of soap with a textured surface on a white background

Bia Unscented Soap

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Before Image Before

Clinical Results

99%

decrease in number of atopic exacerbations in 100% subjects in 8 weeks

93%

decrease in SCORAD in 100% subject in 8 weeks

118%

increase in hydration in 8 weeks

Open label trial, 32 men and women, aged 18+ with moderate, active atopic dermatitis (average SCORAD=40) over 56 days (Eurofins, Poland, 2025).

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SOOTHE ECZEMA WITHOUT STEROIDS BY BOOSTING GUT & SKIN BARRIER HEALTH WITH THE Gut Barrier Eczema Relief System (Ages: 12+)

Eczema can take a toll with daily discomfort, disrupted sleep, low self-esteem and even depression. 

Did you know that 30-40% of your eczema score can be improved through your gut? That’s why our advanced system addresses eczema from both the inside and outside.

The prebiotic + probiotic supplement duo is designed to soothe eczema from the inside with a healthy gut barrier, a stronger gut lining, better digestion of nutrients and a balanced gut microbiome. [image: https://www.mdpi.com/2072-6643/15/14/3123]

Our soap and lotion* protect and soothe your skin from outside aggression by supporting your skin microbiome while fortifying skin barrier, deeply hydrating, calming itch, and reducing flakiness.


*National Eczema Association Seal of Acceptance

  • Microbiome Friendly Logo

    Microbiome-tested

  • Vegan Society Logo

    Plant-Based

  • Cruely Free Logo

    Cruelty-Free

The Antü Skin Barrier Support Supplement contains a remarkable combination of ingredients to strengthen the skin barrier. The L-histidine alone has been shown to help heal damaged skin, but together with other anti-inflammatory and supportive botanicals make this a truly unique product. The lotion has also been studied in those with sensitive skin, and is packed with active botanicals designed for impaired skin.

- Dr. Peter Lio, MD, Pediatric Dermatologist, Northwestern Medicine

01 / 03
- Dr. Peter Lio, MD, Pediatric Dermatologist, Northwestern Medicine

For the Bia eczema collection, we have clinical results that conclusively prove the significant treatment synergy of topical and supplements in repairing the gut and skin barriers, as well as alleviating itch.

Professor Philippe Humber MD FAAD

02 / 03
Professor Philippe Humber MD FAAD

Eczema can be associated with a weakened skin barrier, changes in the skin and gut microbiome, and an impaired gut barrier. The Bia supplements and topicals are formulated to support eczema from the inside and out.

Dr. Jessica Maloh

03 / 03
Dr. Jessica Maloh

Frequently Asked Questions

Are these products clinically tested? +

Our claims are not just fluff, they’re facts. We conduct clinical tests and publish the data to prove how our products perform. You’ll see real results in your skin.

Are these products sustainable? +

We minimize the environmental impact of every aspect of our operation. We are focused on being carbon neutral, cleaning plastic in the ocean, and protecting biodiversity.

Are these products internationally compliant? +

Every country has their own cosmetics laws. We comply with those regulations and register with governmental health authorities wherever we are sold.

Are these products patented? +

Our plant-based biotech complexes are not only patented, they’re disruptive: hydration (BiaComplex™), skin barrier protection (AntuComplex™) and our food-grade preservation (PreservX™). We innovate skincare breakthroughs.

Is the supply chain controlled? +

We know what’s in every tube, literally. We control the complete supply chain — from sustainable wild harvesting through pharma-grade clean processes and our airless packaging — to achieve the highest quality possible.

Is the manufacturing process certified? +

We apply current Good Manufacturing Practices (cGMP) to our production process to create consistent high quality and performance as well as prevent contamination.

How long until I see results? +

In clinical studies, people saw major improvements after 8 weeks of consistent use. Some may see results sooner. While 100% of people experienced improvement in trials, for a few individuals, their skin may need additional support.

Why isn’t the effect immediate? +

The Skin Barrier Eczema Relief System uses two approaches to improve skin integrity for those who have a genetic deficiency in skin barrier protein production. First, the bioactive phytocomplex - or plant components - are antioxidants, helping to reduce damage caused by inflammation. Second, the L-histidine in the supplement promotes increased production of the skin barrier protein filaggrin. Filaggrin deficiency is common in those with eczema, and building up levels may take a few weeks.

How does the skin barrier supplement work? +

The Skin Barrier Eczema Relief System uses two approaches to improve skin integrity for those who have a genetic deficiency in skin barrier protein production. First, the bioactive phytocomplex - or plant components - are antioxidants, helping to reduce damage caused by inflammation. Second, the L-histidine in the supplement promotes increased production of the skin barrier protein filaggrin. Filaggrin deficiency is common in those with eczema, and building up levels may take a few weeks.

For how long can I take the product? +

The ingredients in the Skin Barrier Eczema Relief System have demonstrated safety in clinical trials, and no adverse events have been related to their use. Continued use can help to continually support the production of the skin barrier protein filaggrin. Yet long-term use (beyond 3-6 months) of any supplement should be discussed with your healthcare provider.

Why isn’t my eczema fully resolved? +

The Skin Barrier systems include a topical lotion and soap, as well as a supplement that helps to decrease inflammatory damage and build skin barrier proteins. Yet each person’s eczema is different, and flare-ups also depend on gut integrity.

While some may see full resolution with a skin barrier restoration-focused approach, others may need to address inflammation and dysbiosis in the gut - and some may need both. Both Gut Barrier and Skin Barrier Eczema Relief Systems include a topical lotion and soap to help promote healing, so a Skin Barrier Relief system can be completed with a Gut Barrier Support Set, while the Gut Barrier Relief System can be bolstered with a Skin Barrier supplement.

For example, ff you have been using the skin barrier support system consistently for 8 or more weeks but your skin has plateaued or you are still getting the occasional flare, consider expanding your support. The BIA GutBuilder Prebiotic Supplement and BIA ClearSkin Synbiotic Supplement (Gut Barrier Support Set) can provide additional results because they promote a stronger gut barrier and the right bacteria to calm your allergic immune response - both common contributors to eczema flares.

While our Eczema Relief Systems can lead to significant improvement, eczema is a chronic and multi-factorial condition. Symptoms can be influenced by many factors, including climate and environmental exposures, diet, heavy metal exposure, or psychological stress. For this reason, it can be helpful to work with an integrative health care provider to address the many factors that may contribute to your eczema.

The Eczema Relief lotion makes my skin feel worse - should I stop using it? +

Most users experience a calm, soothing effect with consistent use of the lotion. However, it is important to note that the biotech actives ingredient in this product, such as comfrey or calendula, or preservative ingredients, sodium benzoate or potassium sorbate, may not be for everyone.

For those with more severely damaged skin, the lotion can penetrate too deeply, activating sensory nerves. Consider using water-free products (oil-based) to begin strengthening the skin barrier. After initial improvements, the lotion may be better tolerated.

It is also important to note that, while less common, those with eczema are at higher risk for allergies, which may include comfrey, calendula or preservatives. Consider testing the lotion by applying it to skin behind the ear unaffected by eczema. If this area becomes red, irritated, or itchy, this is a sign to discontinue use and use a water-free product. At any time while using, if you notice hives or worsening eczema, consult your healthcare provider.

If I’m introducing one product at a time, which should I start with? +

There is no set order in which we recommend beginning your products, but here are a few considerations:

  1. The BIA soap can be used next to prepare skin for improvement without drying or stripping of natural oils and skin microbes.
  2. The Eczema Relief Lotion can be started last.
  3. The Skin Barrier supplement can be introduced first to start rebuilding and fortifying the skin barrier.
Should I use the Skin Barrier or the Gut Barrier Eczema Relief System? +

Which approach is best for you may depend on the major driver of your symptoms, and for some, using both may be most ideal.

Those who have more severe skin barrier disruption like red, itchy or burning patches or dry, rough, sensitive skin may want to start with supporting the proteins that make the skin barrier. For others who also have GI symptoms such as bloating, gas, or discomfort, this may be a sign that restoring gut health may be the best place to start.

Wherever you start, both systems have the Eczema Relief Lotion and BIA Unscented soap, which help soothe itch and hydrate skin without stripping the body’s natural oils and microbiome. Plus, you can always add the ANTU Skin Barrier Support (part of the Skin Barrier Eczema Relief System) or the BIA ClearSkin Synbiotic Supplement and BIA ClearSkin Synbiotic Supplement (part of the Gut Barrier Eczema Relief System) products separately.

What should I do to maintain my results? +

Because eczema is a chronic condition, ongoing healthy skin routines are important to maintain the progress you’ve made. This includes continued support of the skin barrier with a topical like the BIA Eczema Relief Lotion, and a gentle, microbiome-friendly soap like the BIA Unscented soap.

Because some people with eczema have a genetic reason for filaggrin deficiency, ongoing l-histidine supplementation with the ANTU Skin Barrier Supplement may be needed to continue supporting filaggrin formation and skin barrier function. However, even those without a genetic mutation in filaggrin may benefit from ongoing l-histidine use. After 2-3 months of regular use at 4g/day, you may consider reducing the dose to 2/g while monitoring skin response. The goal is to find the lowest effective dose that maintains improvement. Long-term use (beyond 3-6 months) of any supplement should be discussed with your healthcare provider.

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