Skin Atlas
Definition & Application
An archive of mapped terms.
Classified within the context of modern skincare.
Skin Microbiome: What it is, how it works, and how to protect it
The skin microbiome refers to the entirety of microorganisms that live in symbiosis with human skin. An intact microbial balance protects against harmful substances, stabilizes the pH value, and is an essential factor in modern skincare.
TABLE OF CONTENTS
What is the skin microbiome?
On healthy skin, up to a million microorganisms exist per square centimeter. Dominant genera include Staphylococcus epidermidis, Cutibacterium acnes, and Corynebacterium. These form an ecological balance that depends on moisture, temperature, sebum production, and pH value. If this balance is disrupted, irritation, dryness, or acne can occur.
How does the microbiome affect the skin?
The microbiome works closely with the lipid barrier. It helps produce antimicrobial peptides and strengthens the skin's immune defense. If the barrier is weakened, the microorganisms lose their balance. According to Byrd et al. (2022), disrupted microbiome diversity increases skin sensitivity and its tendency to inflammation.
An intact skin microbiome simultaneously fulfills several protective functions:
- Protection against pathogenic germs through competition for nutrients and binding sites
- Stabilization of the pH value in the slightly acidic range (pH 4.5–5.5)
- Support of the barrier function through antimicrobial metabolic products
- Regulation of inflammatory processes and strengthening of the immune response
A balanced microbiome is not a byproduct of healthy skin – it is one of its conditions.
Microbiome-friendly care
Care products and cleansers directly influence the microbiome. Aggressive surfactants, alcohol, and synthetic fragrances can damage the protective microflora. For a microbiome-friendly routine, it is recommended to:
- Gentle cleansing with pH-neutral or slightly acidic products
- Avoidance of alcohol and synthetic fragrances
- Moisturizing lipids like squalane as a supplement
- Regular incorporation of probiotic or prebiotic active ingredients
Environmental factors such as UV radiation and air pollution, as well as influences like diet, stress, and sleep, also affect the microbial diversity of the skin.
Combination with other active ingredients
Probiotic cosmetics contain inactive microorganisms or their metabolites, thereby supporting the natural flora. Prebiotic formulations provide nutrients such as inulin or alpha-glucan oligosaccharides, which specifically promote beneficial skin bacteria. Both approaches, according to Lee et al. (2022) in clinical studies, improve barrier function and can reduce skin redness. Care oils with bioactive phytosterols and lipids also create a stable environment for the microbiome without disturbing the natural bacterial diversity.
Who is microbiome-friendly care suitable for?
Microbiome-friendly care is beneficial for all skin types, but especially for sensitive and redness-prone skin, skin with acne, eczema, or rosacea, as well as dry or dehydrated skin with a weakened barrier. A diet rich in fiber and polyphenols – such as green tea, berries, or fermented foods – can additionally support the skin microbiome. The so-called Gut-Skin-Axis describes the close connection between gut flora and microbial skin balance.
Frequently asked questions about the skin microbiome
How does pH affect the skin microbiome?
A slightly acidic skin environment with a pH of 4.5–5.5 promotes beneficial bacteria like Staphylococcus epidermidis and inhibits harmful germs. Products with too high a pH disturb this balance and can permanently weaken the microflora.
What particularly harms the skin microbiome?
Aggressive cleansers with strong surfactants, alcohol, and synthetic fragrances are the most damaging to the natural microflora. Excessive washing, UV exposure, and chronic stress also negatively affect the microbial diversity of the skin.
Does probiotic care help the skin microbiome?
Probiotic cosmetics can support the skin microbiome by providing beneficial bacterial strains or their metabolic products. In combination with prebiotic ingredients like inulin, the diversity of the skin flora is promoted, and the barrier function is strengthened.
Conclusion
The skin microbiome is a complex but essential ecosystem of the skin. Gentle, microbiome-friendly products support the natural barrier and help maintain a stable microbial balance – a central building block of modern and effective skincare.
References
- Byrd AL et al. (2022): Cutaneous Microbiome and Barrier Interaction – J Invest Dermatol
- Lee H et al. (2022): Prebiotics and Probiotics in Cosmetics – Front Microbiol
- Nakatsuji T et al. (2021): Antimicrobial Peptides and Microbiome Equilibrium – J Invest Dermatol
- Front Cell Infect Microbiol (2023): Gut-Skin Axis and Microbiome Health Review
