Can Your Gut Affect Your Skin?

What is the gut-skin axis?

The gut-skin axis is the two-way relationship between your gut and your skin. Your gut and skin are in constant communication through your immune system, inflammation levels, and the by-products your gut bacteria produce. When your gut is balanced, this relationship tends to support clear, healthy skin. When it's disrupted, the same channels can carry inflammation that affects your skin instead. In other words, the state of your gut and the state of your skin are more closely connected than they look.

→ What Is Gut Dysbiosis?

How does your gut affect your skin?

Your gut influences your skin mainly through inflammation, immune regulation, and nutrient absorption:

• Inflammation: An imbalanced gut can contribute to systemic inflammation, which may worsen inflammatory skin conditions.
• Immune regulation: Much of your immune activity is shaped in the gut, so gut balance can influence immune responses that also affect the skin.
• Nutrient absorption: Your gut helps process and absorb nutrients involved in skin barrier function, repair and antioxidant defence.
• Bacterial by-products: When the gut barrier is disrupted, microbial metabolites and bacterial components may enter circulation or alter immune signalling in ways that affect the skin.

These work together, which is why gut health tends to influence skin health as a whole rather than through any single pathway.

Which skin conditions are linked to gut health?

Several common skin conditions, including acne, eczema, rosacea and psoriasis, have been linked to gut microbiome differences, though the gut is one factor among many rather than the sole cause.

• Acne: Research has associated gut imbalance with acne, possibly through inflammation, immune signalling and metabolic pathways.
• Eczema: Differences in gut bacteria have been linked to eczema, particularly in early life.
• Rosacea: Rosacea has been associated with gut conditions such as SIBO and other gastrointestinal disorders, suggesting a possible gut link.
• Psoriasis: Psoriasis, an inflammatory condition, has been linked to gut microbiome changes and altered immune signalling.

In each case the relationship is an association, not proof that the gut directly causes the condition, but the links are strong enough that gut health is increasingly considered part of the picture.

What are the signs your skin issues might be gut-related?

There's no definite way to tell from the outside, but some possible indicators that your skin issues could be connected to your gut include skin problems that appear alongside digestive symptoms like bloating or irregular bowel movements, breakouts or flare-ups that seem to track with your diet, skin issues that haven't responded well to topical treatments alone, and flare-ups during periods of high stress, which affects both gut and skin. These are soft indicators rather than proof, but if several apply, your gut may be worth considering as part of the picture.

→ 7 Signs of an Unhealthy Gut (and What They Mean)

How can you support your skin through your gut?

Supporting your gut may help support your skin, and the steps are the same ones that build a healthy gut generally:

• Eat more fibre and variety to feed a diverse range of good bacteria
• Add fermented foods like yoghurt, kefir, and sauerkraut
• Limit sugar and ultra-processed food, which can feed less helpful bacteria and drive inflammation
• Prioritise sleep, which supports both gut and skin repair
• Manage stress, since it affects gut balance and skin flare-ups alike

These changes work gradually, so consistency matters more than quick fixes.

How can a gut microbiome test help?

A gut microbiome test can show you the balance of bacteria in your own gut, which is useful because everyone's gut is different. It won't diagnose a skin condition or tell you exactly why your skin behaves the way it does, but it can give you a clearer picture of your gut as a starting point, so any changes you make are based on your own body rather than general advice.

→ Explore the Gut Microbiome Test
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→ Best Foods for Gut Health: What to Eat (and Why)
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