The Gut–Skin Connection: Why Healing Your Gut Can Help Clear Acne

If you’ve been struggling with acne, you’ve probably been told it’s all about hormones, bacteria or your skincare routine. While these can all play a role, one often-overlooked area is the health of your gut.

Growing research continues to support the concept of the gut–skin axis—the complex, two-way communication network between the gastrointestinal tract, immune system, endocrine (hormonal) system, and the skin. This means that when gut health becomes compromised, it can influence inflammation, hormone metabolism, immune regulation, and the skin’s barrier function, all of which may contribute to acne development and persistence.

What is the gut–skin axis?

Your gut is home to trillions of bacteria, fungi, and other microorganisms, collectively known as the gut microbiome. These microorganisms are far from passive—they actively influence many aspects of human health.

A balanced and diverse microbiome helps to:

• Support efficient digestion and nutrient absorption

• Produce vitamins and beneficial short-chain fatty acids that nourish the intestinal lining

• Regulate both innate and adaptive immune responses

• Maintain the integrity of the intestinal barrier

• Control inflammatory pathways throughout the body

• Communicate with the brain through the gut–brain axis

When the microbiome loses diversity or beneficial bacteria decline, a state known as dysbiosis less favourable microbes may become more dominant. This imbalance has been associated with increased intestinal inflammation, altered immune function, and changes in hormone metabolism, all of which may contribute to inflammatory skin conditions, including acne.

How imbalanced gut health can contribute to acne increased inflammation

Approximately 70–80% of the body’s immune tissue is located within the gut-associated lymphoid tissue (GALT), making the gastrointestinal tract one of the body’s largest immune organs.

When the gut microbiome becomes disrupted, immune cells may produce greater amounts of pro-inflammatory cytokines, such as interleukin-6 (IL-6) and tumour necrosis factor-alpha (TNF-α). These inflammatory signalling molecules can circulate throughout the body, contributing to the chronic low-grade inflammation often associated with acne and potentially increasing redness, swelling and delayed skin healing.

A weakened gut barrier

The intestinal lining acts as a selective barrier, allowing nutrients to be absorbed while preventing harmful bacteria, toxins and undigested food particles from entering the bloodstream.

When this barrier becomes compromised, a phenomenon often referred to as increased intestinal permeability or “leaky gut”—bacterial components such as lipopolysaccharides (LPS) may enter circulation. This can activate the immune system, increase systemic inflammation and potentially exacerbate inflammatory skin conditions in susceptible individuals.

Although intestinal permeability remains an active area of research, growing evidence suggests it may play a role in a number of chronic inflammatory conditions, including acne.

Altered hormone metabolism

The gut also plays an important role in hormone regulation, particularly the metabolism and elimination of oestrogen.

A collection of gut bacteria known as the estrobolome produces an enzyme called beta-glucuronidase. Under normal circumstances, the liver prepares excess oestrogen for excretion via bile. However, when beta-glucuronidase activity becomes excessive, these bacteria can deconjugate oestrogen, allowing it to be reabsorbed back into the bloodstream instead of being eliminated.

For some individuals, this may contribute to altered oestrogen balance, which can influence the delicate relationship between oestrogen and androgens - hormones that play a significant role in sebum production and acne development. Elevated beta-glucuronidase activity has also been associated with dysbiosis, low fibre intake, and reduced microbial diversity.

Nutrient deficiencies

Healthy skin depends on nutrients, including:

• Zinc

• Vitamin A

• Vitamin D

• Omega-3 fats

• B vitamins

Poor digestion or an unhealthy gut may reduce your ability to absorb these nutrients effectively, making it harder for your skin to repair itself.

The gut–brain–skin connection

Stress doesn’t only affect your mind—it also affects your gut.

Chronic stress can:

• Reduce beneficial bacteria

• Slow digestion

• Increase intestinal permeability

• Raise cortisol levels

• Increase inflammation

  
  

This is one reason why stress often triggers acne flare-ups.

Signs your gut may need support

While digestive symptoms aren’t always present, common signs include:

• Bloating

• Constipation or diarrhoea

• Food sensitivities

• Reflux

• Frequent antibiotic use in the past

• Persistent fatigue

• Recurrent acne that doesn’t respond to skincare alone

  
  

Many people with acne have very few digestive symptoms despite underlying imbalances.

Supporting the gut for healthier skin

Improving gut health isn’t about following restrictive diets or expensive cleanses. Instead, focus on building healthy foundations.

Alongside diet and lifestyle changes, targeted herbal and nutritional support may also help. When symptoms persist, the most effective approach is one that is personalised to your individual needs and symptoms.

Eat a varied, fibre-rich diet

Plant foods help feed beneficial gut bacteria.

Aim to include:

• Vegetables

• Fruits

• Beans and legumes

• Nuts and seeds

• Whole grains (if tolerated)

  
  

Include fermented foods

Foods such as:

• Kefir

• Natural yoghurt

• Sauerkraut

• Kimchi

  
  

They may help support microbial diversity in some individuals.

Prioritise protein

Protein provides the amino acids your body needs for tissue repair, immune function and skin healing.

Reduce ultra-processed foods

Highly processed foods that are high in refined sugars and low in fibre may negatively affect the gut microbiome when eaten regularly.

Manage stress

Supporting your nervous system can positively influence both gut function and skin health.

Consider:

• Daily walks

• Breathwork

• Meditation

• Good sleep habits

• Gentle exercise

  
  

Support regular bowel movements

Healthy elimination is one of the body’s natural ways of removing waste products, including hormones and toxins.

Hydration, fibre and movement all play an important role.

Can supplements help?

For some people, targeted supplementation can be a great support the gut alongside dietary and lifestyle changes.

Ingredients that have been researched for supporting both gut and skin health—and are all included in our Skin-Calm supplement—include:

• Specific probiotic strains

• Prebiotic fibres

• L-glutamine

• Zinc

• Vitamin D

• Anti-inflammatory botanicals

• 
  

The bottom line

Acne is rarely caused by one single factor. Hormones, genetics, stress, nutrition, skincare and gut health can all interact.

Supporting your gut won’t clear everyone’s acne overnight, but improving digestion, reducing inflammation and creating a healthier microbiome may remove one of the underlying drivers contributing to persistent breakouts.

We’ve had wonderful feedback from customers using Skin-Calm to support their skin from the inside out. Formulated to support gut health, hormone balance, healthy inflammatory responses and the body’s natural stress response, every purchase also includes our Acne 360 eBook, covering gut health, nutrition, hormones, stress management, skincare and lifestyle to help you take a more holistic approach to acne.

Disclaimer

This article is intended for educational purposes only and should not replace personalised medical advice. If you have persistent acne or digestive symptoms, seek advice from a qualified healthcare professional.