The so-called gut–skin axis is one of the most exciting areas of research in modern dermatology. Studies indicate that the gut microbiome, immune system, stress, and skin health are closely interconnected. After all, our skin is not just an outer covering. It responds sensitively to inflammation, stress, nutrition, and changes in the gut.

The good news:
Understanding how the gut, brain, and skin interact may help you support healthy skin more effectively—from the inside out.

In this article, you'll learn:

• what the gut–skin axis actually is
• why stress can worsen skin problems
• the role of the microbiome in skin health
• and how you can support your skin holistically

What Is the Gut–Skin Axis?

The gut–skin axis describes the connection between the gut and the skin through the immune system, inflammatory signaling molecules, and the bloodstream. When the gut microbiome becomes imbalanced, it may also affect the skin.

Current research suggests that intestinal inflammation, a compromised gut barrier, and alterations in the gut microbiota may contribute to skin problems. Think of your gut as the foundation of a building. If the foundation is strong, the facade remains intact. But when cracks develop in the foundation, the consequences often become visible sooner or later on the outside wall—your skin.

What makes this particularly fascinating is that the relationship works both ways. The skin also has its own microbiome, and there is continuous "cross-talk" between the gut and skin microbiomes.

Can an Unhealthy Gut Cause Skin Problems?

In short: yes.

Scientific studies show that an imbalanced gut microbiome may be associated with various skin conditions. Three main mechanisms appear to be involved:

1. Inflammatory Signals

When the gut microbiota becomes imbalanced—a condition known as dysbiosis—more inflammatory signaling molecules may be produced. These can enter the bloodstream and influence the skin.

2. Leaky Gut and Skin Health

When the intestinal barrier becomes more permeable, this is often referred to as leaky gut. Undigested particles and bacterial components can then more easily enter the bloodstream. The immune system responds with inflammatory processes that may also manifest in the skin.

3. Nutrient Absorption

An imbalanced microbiome can impair the absorption of important nutrients. Zinc, vitamin A, and omega-3 fatty acids are particularly important for maintaining the skin barrier, supporting regeneration, and promoting a healthy complexion.

Which Skin Conditions Are Linked to the Gut?

Not every skin condition originates in the gut. However, research suggests that certain skin concerns may be associated with changes in the microbiome.

Acne

Studies show that people with acne are more likely to have microbiome imbalances. An inflammatory gut environment may also promote excessive sebum production and inflammatory skin reactions.

Atopic Dermatitis (Eczema)

Reduced diversity of the gut microbiome is frequently observed in individuals with eczema. Current research suggests that lower microbiome diversity may be associated with more frequent eczema flare-ups.

Rosacea and Redness

A compromised gut barrier, increased intestinal permeability, and inflammatory processes in the gut may also play a role in rosacea, according to current research.

Important: Skin conditions are always multifactorial. Gut health may be one contributing factor, but it is rarely the sole cause.

Can Stress Cause Skin Problems? The Gut–Brain–Skin Axis

You may have noticed that your skin tends to react during stressful periods. Breakouts, redness, and irritation often become more pronounced. This is because stress directly affects the gut–brain–skin axis.

The mechanism can be simplified into three steps:

1. Stress activates the nervous system and increases cortisol production.
2. Cortisol may weaken the intestinal lining and promote dysbiosis.
3. Inflammatory signaling molecules enter the bloodstream and can intensify skin reactions.

Stress doesn't just show on your face—it affects your gut as well.

Particularly interesting is the growing research into the relationship between the skin microbiome and mental well-being. A study published in 2025 was the first to demonstrate body-site-specific associations between the skin microbiome and psychological well-being.

Supporting the gut–brain axis may therefore also help support skin health and resilience to stress. The bacterial strains Lactobacillus helveticus and Bifidobacterium longum—two of the five strains found in BioMe+—have been specifically studied in the context of the gut–brain axis and may help mitigate the effects of stress on the gut.

What Can You Do for Healthy, Beautiful Skin?

Treating the skin externally is often not enough. A more holistic approach that considers nutrition, gut health, and stress management is usually more effective.

1. Eat a Gut-Friendly Diet

A gut-friendly diet forms the foundation for a diverse microbiome and may help support a balanced inflammatory response.

Dietary fiber is particularly important because it serves as food for beneficial gut bacteria. Good sources include oats, legumes, flaxseeds, vegetables, and whole grains.

Polyphenols also play an important role. These plant compounds are found in colorful fruits and vegetables, berries, green tea, coffee, cocoa, olive oil, and red onions. They may support beneficial gut bacteria and positively influence inflammatory processes in the gut.

Omega-3 fatty acids have anti-inflammatory properties and support both the skin and intestinal barriers. Excellent sources of the active forms DHA and EPA include fatty fish such as salmon, mackerel, and herring.

Fermented foods such as natural yogurt, kefir, sauerkraut, and kimchi may also support gut health. Adequate hydration is equally important, as fiber can only exert its full benefits when sufficient fluids are consumed.

In general, the more plant-based and diverse your diet, the better it tends to be for the microbiome. Excessive sugar, alcohol, and highly processed foods, on the other hand, may promote bacterial imbalances, inflammation, and dysbiosis.

2. Use Probiotics Strategically

Certain strains of Lactobacillus and Bifidobacterium have been associated with anti-inflammatory effects in scientific studies.

For example, a 2024 study investigated the effects of a probiotic formulation on perceived skin quality in young women. Participants reported improvements in their skin quality after taking the formulation over a defined period. Since the study was exploratory in nature, the findings should be considered preliminary and require confirmation in larger, controlled studies.

Nevertheless, these data suggest that targeted probiotic strains may contribute to supporting skin health.

3. Reduce Stress

As discussed above, chronic stress can negatively affect both the gut and the skin.

Even small daily habits can help reduce stress and strengthen resilience, including:

• regular physical activity
• adequate sleep
• breathing exercises
• mindful breaks throughout the day

Summer is an especially good time to focus on skin health. UV exposure, heat, and stress place additional demands on the skin. At the same time, the skin has a form of "memory," making prevention important even at a young age.

Are There Evidence-Based Supplements That Support Skin Health?

In addition to micronutrients such as zinc, vitamin D, and omega-3 fatty acids, probiotics have become a major focus of skin health research. They are particularly interesting because they target the gut microbiome directly—a key interface between the gut, immune system, and skin.

However, not all probiotics are the same. The specific bacterial strains matter.

Some of the best-researched strains in relation to skin health include:

• Lactobacillus rhamnosus → associated with reduced inflammatory markers, particularly in eczema.
• Lactobacillus helveticus → supports the gut barrier, immune balance, and the gut–brain axis.
• Bifidobacterium longum → may influence inflammatory signaling pathways.

Particularly promising is the synbiotic approach, which combines probiotics with prebiotics.

Prebiotics such as FOS and inulin serve as food for beneficial gut bacteria and may enhance their effectiveness. This combination is also found in BioMe+.

How Long Does It Take for Skin to Improve After Supporting Gut Health?

Many people hope for quick results. However, the microbiome does not change overnight.

Research and practical experience suggest that initial improvements may become noticeable after approximately four to eight weeks. Consistency is generally more important than perfection.

Supporting gut health over the long term often supports skin health and overall well-being as well.

If You Really Want to Help Your Skin, Start from Within

Healthy skin does not begin only with external skincare. It often begins in the gut.

BioMe+ combines selected probiotic strains such as Lactobacillus rhamnosus, Lactobacillus helveticus, and Bifidobacterium longum with prebiotics including FOS and inulin, as well as magnesium.

Its unique approach is that BioMe+ supports not only the gut–skin axis but also the gut–brain axis. Better stress regulation often helps protect both the gut and the skin. People who have already tried countless creams may benefit from taking a more holistic approach to their skin health.