000000;">People with chronic skin problems often have compromised liver function. A study in the World Journal of Gastroenterology showed that non-alcoholic fatty liver disease (NAFLD – liver steatosis) is more frequently present in patients with chronic dermatoses. And NAFLD today affects up to 30% of the population – it's not just a problem for alcoholics.
The mechanism is simple: when the liver cannot handle detoxification effectively, toxins circulate in the blood longer than they should. These circulating toxins trigger systemic inflammation. And inflammation, as we already know, promotes Malassezia yeast overgrowth and worsens seborrheic dermatitis.
Warning signs of an overloaded liver:
Chronic fatigue, especially after meals, is the first symptom. If you feel exhausted after every meal, the liver is probably not keeping up with processing the influx of nutrients. Difficulty digesting fats is another warning – if you feel heaviness, bloating or have greasy stools after fatty meals, the gallbladder and liver have a problem.
Dark urine and light stools are alarming signals – they indicate a disorder in bile production or excretion. Yellow discolouration of the whites of the eyes or skin (jaundice) is already serious liver damage. But before that come subtler symptoms like skin problems – acne, eczema, seborrheic dermatitis.
Supporting liver detoxification:
The foundation is testing. Liver enzymes (ALT, AST, GGT) in blood plus liver ultrasound will reveal whether the liver is damaged. Don't neglect this – liver disease in its early stages doesn't cause pain and may have no obvious symptoms.
N-acetylcysteine (NAC) 600 mg 2x daily is a precursor of glutathione – the body's most powerful antioxidant, which is crucial for detoxification. Milk thistle (silymarin) 300 mg daily protects liver cells and supports their regeneration. Glutathione or its precursors (glycine, glutamine, cysteine) directly strengthen detoxification capacity.
Vegetables from the Brassica family – broccoli, cauliflower, cabbage, kale, rocket – contain sulforaphane, a substance that activates detoxification enzymes in the liver. You should eat at least one serving every day. Limiting alcohol, fructose (including fruit juices) and industrially processed foods is a given.
DermBalance Complex® contains NAC and other supportive substances for liver detoxification, because we know that healthy skin starts with a healthy liver.
Insulin resistance – when blood sugar destroys the skin
Insulin resistance means your cells stop responding to insulin properly, leading to high glucose and insulin levels in the blood. Most people think this is only a problem for diabetics. But insulin resistance can exist for years before diabetes develops – and throughout that time it damages your body including the skin.
A study in the Journal of Cosmetic Dermatology (2020) found significantly higher occurrence of seborrheic dermatitis in patients with metabolic syndrome. High insulin levels stimulate sebaceous glands to overproduce sebum via the IGF-1 signalling pathway. More sebum = ideal environment for Malassezia growth.
Furthermore, chronically high blood glucose promotes the growth of all kinds of yeasts – including Candida in the gut and Malassezia on the skin. Yeasts literally "eat" sugar. If you have high glucose, you're feeding them continuously. High insulin also increases systemic inflammation via the NF-κB signalling pathway – yet another vicious cycle.
How to recognise insulin resistance:
Waist circumference is a simple screening tool. If as a man you have more than 94 cm or as a woman more than 80 cm at the waist, the probability of insulin resistance is high. Acanthosis nigricans – dark, brownish, velvety skin folds on the neck, in the armpits, in the groin – is an almost diagnostic symptom.
Sugar cravings and energy fluctuations throughout the day are typical. After eating you feel fatigue instead of energy. After two hours without food you're "hungry as a wolf" and can't concentrate. All of these are symptoms of fluctuating glucose – a consequence of insulin resistance.
Difficulty losing weight, especially around the abdomen, is a frustrating symptom. You can exercise and diet, but the fat around the waist simply won't go away. That's because high insulin prevents fat burning. PCOS in women, seborrheic dermatitis, acne – all are dermatological manifestations of insulin resistance.
The path to insulin normalisation:
Blood tests are the foundation: fasting glucose (optimally below 5.0 mmol/l), HbA1c (below 5.5%), fasting insulin (below 7 μIU/ml), HOMA-IR index (below 1.5). If values are higher, you have insulin resistance even if your doctor says "it's within normal range".
A low-carbohydrate diet or ketogenic diet dramatically improves insulin sensitivity. When you reduce sugar and starch intake, insulin drops and cells begin to "relearn" how to respond to it. Intermittent fasting (16:8 or 18:6) has a similar effect – long periods without food give the body time to lower insulin.
Supplementation can accelerate the process: berberine 500 mg 3x daily has an effect comparable to metformin (a diabetes medication), chromium picolinate 200 mcg improves insulin receptor function, alpha-lipoic acid 600 mg increases insulin sensitivity. Regular exercise, especially strength training, is the best long-term solution – muscles are the body's largest glucose consumer.
Chronic stress – the silent killer of healthy skin
Stress is not just "in your head". Chronic stress disrupts the HPA axis (hypothalamus-pituitary-adrenal) – a complex communication system between the brain and adrenal glands – leading to cortisol dysregulation, chronic inflammation, and weakened immunity. And the consequences show up everywhere, including the skin.
Research in the International Journal of Molecular Sciences (2019) showed a direct link between chronic stress and worsening of seborrheic dermatitis. Stress increases sebum production through neuropeptides, reduces skin immunity (the skin defends itself less effectively against pathogens), and promotes Malassezia growth.
Additionally, chronically high cortisol damages the gut barrier (another contributor to leaky gut), reduces secretory IgA production (immune protection of gut mucous membranes), and disrupts the balance of the gut microbiome. All these factors – which we discussed in the previous sections – are worsened by stress. Stress is a "problem multiplier".
How to recognise an exhausted HPA axis:
Morning fatigue is a classic symptom. You should wake up with energy in the morning – cortisol naturally peaks in the morning. If the morning is the worst part of the day and you need three coffees before you "get going", you probably have a problem. Needing caffeine or sweets for energy during the day is another indicator – the body is looking for a quick energy source because cortisol isn't working properly.
Sleep disturbances, especially waking up between 2-4 AM, are typical. That's the time when cortisol should be at its minimum – if it's high, it wakes you up. Irritability, anxiety, inability to relax even when you have no specific reason for stress – all are symptoms of dysregulated cortisol.
Frequent illnesses and worsening skin problems during stress are clear signals. If every time you have a deadline or a personal crisis you catch a cold or your skin gets worse, it's direct evidence of the connection between stress and immunity.
Restoring the HPA axis:
A salivary cortisol test (morning, noon, evening, night profile) will show you how your cortisol fluctuates throughout the day. Normally it should be high in the morning and gradually decline. If this pattern is disrupted, you know what to address.
Adaptogens are plants that help the body "adapt" to stress: ashwagandha 300-600 mg daily lowers cortisol and reduces anxiety (supported by studies), rhodiola rosea improves energy and stress resilience, holy basil (tulsi) has a calming effect on the nervous system.
Magnesium glycinate or threonate 300-400 mg in the evening supports relaxation and quality sleep – magnesium is the "natural anti-stress mineral". Mindfulness, meditation, breathing exercises – this is not "new age nonsense" but demonstrably effective methods for reducing cortisol. Studies show a 20-30% decrease in cortisol after 8 weeks of regular practice.
Quality sleep is fundamental – 7-9 hours in a dark room, screens off 1 hour before bedtime. If you don't sleep, cortisol doesn't regenerate. It's that simple.
How to combine all 7 causes into one solution
The real solution for seborrheic dermatitis is not in one miracle product or an isolated change. It is in a comprehensive approach that addresses all underlying causes simultaneously. At Epiderma we developed a protocol that combines the best scientific knowledge with practical feasibility.
Phase 1: Diagnostics and preparation (weeks 1-2)
Without proper diagnostics you're just guessing. Blood tests are the foundation: complete blood count, zinc, vitamin D, fasting glucose, HbA1c, fasting insulin, liver enzymes (ALT, AST, GGT). These tests will tell you which causes are present in your case.
A gut microbiome test (GI-MAP or equivalent) will reveal dysbiosis, Candida overgrowth, gut inflammation. It's not a cheap test, but the information you gain is invaluable. Salivary cortisol (4-point daily profile) will show how your HPA axis is functioning.
Based on the results, you'll create an individual plan. Not everyone has all 7 causes – but most people have at least 3-4.
Phase 2: Elimination and gut restoration (weeks 3-10)
An anti-yeast, low-histamine diet is demanding but it works. You eliminate: all added sugar, yeast (bread, beer), gluten, fermented foods (yoghurt, sauerkraut, kombucha), alcohol, aged cheeses, cured meats, tomatoes, avocado, citrus fruits. What's left? Meat, fish, eggs, most vegetables, quinoa, buckwheat, rice, low-sugar fruits (blueberries, raspberries).
Natural antifungals help: oregano oil 150-200 mg capsules 3x daily, caprylic acid 500 mg 3x daily. Probiotics are key – L. plantarum 299v, B. breve B-3, S. boulardii. Gut barrier support: L-glutamine 5 g daily on an empty stomach, zinc-carnosine 75 mg 2x daily.
Within a few weeks our DermBalance Complex® will be available, significantly simplifying these steps – it contains all probiotic strains, prebiotics and supportive nutrients in one product.
Phase 3: Supplementation and detoxification (weeks 3-12)
Targeted supplementation based on tests: zinc 30 mg daily (if deficient), biotin 5 mg daily, vitamin D3 according to levels (usually 2000-4000 IU). Omega-3 (EPA/DHA) 2 g daily – strong anti-inflammatory effect, supported by hundreds of studies.
Liver support: NAC 600 mg 2x daily, milk thistle 300 mg daily. Improving insulin sensitivity: berberine 500 mg 3x daily (if insulin resistance was present). Antioxidants: quercetin 500 mg 2x daily, vitamin C 1000 mg daily.
Phase 4: Stress management and long-term maintenance (ongoing)
Without addressing stress, all other efforts can collapse. Adaptogens are long-term support: ashwagandha 300 mg in the evening, magnesium glycinate 300 mg in the evening. Daily meditation or breathing exercises – 10-15 minutes is enough, but it must be regular. Regular sleep schedule – same bedtime and wake time, even on weekends.
Topical care (throughout)
External care is still important, but no longer the only approach. Ketoconazole shampoo 2x weekly – gradually reduce frequency as the skin improves. Serum with 10% azelaic acid for the face – antifungal and anti-inflammatory effect. Gentle fragrance-free cleansing products – without SLS/SLES, without fragrances.
Our Epiderma.cz products containing patented BETULDIOL® are designed specifically to support skin regeneration and calm inflammation. BETULDIOL® is a natural extract from birch bark with proven antimicrobial and anti-inflammatory effects. You can use them alongside ketoconazole – they complement each other.
We have a complete range of products for different types of problematic skin – bioactive creams, balms, cleansing waters – all hypoallergenic, fragrance-free, dermatologically tested. And soon we'll add DermBalance Complex® for support from within.
This article has shown you seven causes that are supported by scientific studies published in reputable journals, but which are almost never tested in routine dermatological practice. Why? Because it requires comprehensive diagnostics (gut tests, detailed metabolic examination), time-consuming consultation (30-60 minutes instead of the standard 5-10), and an interdisciplinary approach (collaboration between dermatologist, gastroenterologist, nutritional therapist).
The current healthcare system is simply not set up for this. The doctor has 10 minutes per patient, cannot prescribe gut tests (they're not covered by insurance), and their education was primarily focused on pharmacological treatment, not on nutritional therapy or functional medicine.
This doesn't mean dermatologists are bad doctors. It means the system has limits. And you as a patient can overcome these limits through your own initiative.
Each of these seven causes is powerful enough on its own to trigger or maintain seborrheic dermatitis:
- Disrupted gut microflora creates systemic inflammation
- Yeast overgrowth in the gut promotes Malassezia growth on the skin
- Nutrient deficiency weakens the skin barrier and immunity
- Histamine intolerance maintains chronic inflammation
- Detoxification failure burdens the skin with toxins
- Insulin resistance stimulates sebum overproduction
- Chronic stress disrupts immunity and worsens all other factors
When you have several at once – which is the reality for most patients – standard topical treatment has no chance of success. You can have the most effective antifungal shampoo, but if your immune system is weakened by stress, your gut is full of yeast, and you have insulin resistance, the shampoo will only have a temporary effect.
A comprehensive functional medicine approach that addresses all these factors simultaneously has, according to the clinical experience of functional medicine practitioners, a success rate of 70-85% in chronic cases of seborrheic dermatitis. But it requires time (3-6 months for visible results), patience (dietary and lifestyle changes are not easy), and willingness to look at your body as a whole, not as a collection of isolated symptoms.
At Epiderma, we believe in exactly this approach. That's why we don't just make "another cream for seborrheic dermatitis". We offer a comprehensive solution – external care with BETULDIOL® that soothes and regenerates the skin, and soon also internal support with DermBalance Complex® that addresses causes at the root.
Because true skin health begins inside the body.
This article was created by the Epiderma team based on the latest scientific findings from the fields of functional medicine and dermatology. The information in this article does not replace medical advice. If you suffer from seborrheic dermatitis or any other skin condition, consult your doctor before starting any supplementation or changing your treatment. Epiderma products are a complement to, not a replacement for, professional medical care.