What is the skin microbiome?
The skin microbiome, sometimes called skin flora, is the collection of microorganisms that live on your skin — including bacteria, fungi, and other microorganisms. Thousands of species are present, forming a complex, dynamic ecosystem that plays an important role in skin health.[1]
These microorganisms interact with your skin's natural oils, moisture, and salts. When the microbiome is balanced, it helps support the skin barrier, protect against environmental stress, and maintain overall comfort. It also communicates directly with the immune system, helping to calibrate the skin's inflammatory response to environmental triggers.
The microbiome isn't uniform across the body — its composition shifts depending on location, moisture levels, sebaceous activity, and environmental exposure. The face, for example, hosts a distinct microbial community compared to the scalp or hands. Like any ecosystem, balance matters.
Beneficial bacteria and skin health
Bacteria often get a bad reputation, but many strains are essential to healthy skin. Species like Staphylococcus epidermidis — one of the most abundant bacteria on human skin — play a protective role by outcompeting potentially harmful microorganisms and supporting the skin's natural antimicrobial defenses.
Beneficial microbes also help defend against environmental stressors like pollution, wind, and temperature changes by supporting the skin's natural barrier function. Some strains produce compounds that help maintain an acidic skin pH, which creates a less hospitable environment for harmful bacteria.
When the skin barrier and microbiome work together, skin is better equipped to stay calm, resilient, and balanced. Disruptions to this system — through illness, medication, stress, or overly aggressive skincare — can make skin feel more reactive or uncomfortable.
When the skin microbiome feels out of balance
An imbalanced microbiome can show up in different ways, including redness, dryness, flaking, itching, or increased sensitivity. These signs are often the skin's way of asking for more support, not stronger treatments. Conditions such as rosacea, eczema, and acne have all been linked to shifts in microbiome composition, though research in this area is still evolving.
Restoring balance usually starts with gentler care — simplifying your routine, reducing harsh actives, and choosing products formulated to work with the skin's natural environment rather than against it.
How your skincare routine affects your microbiome
The products you use every day have a direct influence on the health of your skin microbiome. Surfactants, pH, preservatives, and active ingredients all interact with the skin's surface environment in ways that can either support or disrupt microbial balance.
Alcohol-based products, high-concentration acids, and harsh physical exfoliants can reduce microbial diversity on the skin's surface. While some degree of exfoliation supports healthy cell turnover, the key is frequency and formula strength — overuse can tip the microbiome out of balance and compromise the very barrier you're trying to support.
Fragrance — both synthetic and natural — is another common disruptor. Even well-tolerated fragrance ingredients can affect microbial populations over time, which is one of the reasons our formulas are created with dermal limits and fragrance allergens in mind. Proper product hygiene practices also play a role in preventing external contamination from affecting the skin's microbial environment.
How to balance your skin microbiome
Balancing your skin microbiome comes down to a few consistent habits: cleanse gently, respect your skin's natural pH, support gut health from within, and avoid over-exfoliating or over-fragrancing your routine. None of this requires a complicated regimen, just fewer disruptions and more consistency.
Keep cleansing gentle
Over-cleansing and the use of harsh surfactants are among the most common ways people inadvertently disrupt the skin microbiome. Strong cleansing agents strip away not only surface debris but also the natural oils and beneficial microorganisms that help maintain a healthy skin environment.
Gentle cleansing helps maintain moisture while respecting the microbiome.[2] A pH-balanced, mild cleanser removes impurities without compromising the skin's natural microbial balance. Think of it as supporting the ecosystem rather than stripping it down.
Cleansing once in the evening — rather than twice daily — is often sufficient for sensitive or microbiome-compromised skin. A gentle rinse with water in the morning may be all that's needed before applying your morning routine.
Understand skin pH
Healthy skin maintains a slightly acidic pH, typically around 5. This environment helps beneficial microbes thrive while discouraging less helpful ones.[3] It also supports the natural activity of skin enzymes involved in barrier repair.
Many traditional soaps are alkaline, with a pH closer to 9 or 10, which can significantly disrupt this balance. Even brief exposure to alkaline cleansers can shift skin pH, and repeated use can make it harder for the microbiome to re-establish equilibrium. Choosing pH-compatible skincare — particularly your cleanser and toner — helps support both the microbiome and the skin barrier over time.
Support gut health
The gut and skin are closely connected through what researchers call the gut-skin axis — a network of immune signals, hormones, and microbial metabolites that links intestinal health to skin behavior. An imbalanced gut microbiome can trigger systemic inflammation that shows up on the skin as sensitivity, redness, or breakouts.[4] For a full look at this relationship, see our guide to the gut–skin connection.
Diet, hydration, and overall wellness all influence how skin behaves and feels. Eating whole foods rich in fiber, fermented foods that support beneficial gut bacteria, and antioxidant-rich fruits and vegetables can have a positive ripple effect on skin comfort and balance. Staying well hydrated throughout the day supports both gut and skin function.
Fermented botanicals and microbiome support
Fermentation is one of the more interesting frontiers in microbiome-aware skincare. Because fermentation partially pre-processes plant compounds, skin can access their benefits more readily, and fermented botanical ingredients are being explored for their potential to support a skin environment that encourages microbial diversity and balance. This is part of why we favor botanical bioferments in select formulas.
The gut-skin connection runs in both directions, too: supporting gut microbial balance through diet may help ease the kind of systemic inflammation that shows up as skin sensitivity, which is why gentle, whole-food-supportive habits and gentle topical care tend to work best together.[4]
Why the skin microbiome matters
Research into the skin microbiome is still evolving, but one thing is increasingly clear: a healthy microbiome plays a meaningful role in skin comfort, resilience, and long-term skin health. It's not separate from skin barrier function — it is an integral part of it.
This is also central to a positive aging approach: rather than trying to override skin's natural processes, supporting the microbiome helps skin adapt and stay resilient at every stage of life.
Supporting this system doesn't require complicated routines. Gentle care, balanced formulations, consistency, and an understanding of what your skin actually needs go a long way.
A microbiome-friendly approach to skincare
Building a routine that supports your skin microbiome comes down to a few consistent principles: gentle cleansing, hydration that works with the skin's natural moisture factors, and barrier-supportive ingredients that don't overwhelm the skin's own ecosystem.
Our Habitual hydrator is formulated with botanical oils and skin-compatible actives that help maintain the lipid-rich environment beneficial microorganisms need to thrive. Paired with a simple three-step routine, it supports the skin's natural resilience without disrupting the microbial balance that helps keep skin calm.
For a deeper look at how the skin barrier and microbiome work together, our skin barrier guide is a helpful companion to this article.
When the skin's ecosystem is supported, skin is more likely to look and feel its best — not through intensity, but through consistency and care.
Frequently asked questions
How do I balance my skin microbiome? Cleanse gently, respect your skin's natural pH (around 5), avoid over-exfoliating or over-fragrancing your routine, and support gut health through diet and hydration.[3]
What does an unbalanced skin microbiome look like? Redness, dryness, flaking, itching, or increased sensitivity are common signs, often signaling a need for gentler care rather than stronger treatment.
How can I improve my skin microbiome naturally? Simplify your routine, use a pH-balanced cleanser, limit harsh actives and added fragrance, and support your gut through whole foods and hydration.
References
- Grice EA, Segre JA. The skin microbiome. Nat Rev Microbiol. 2011;9(4):244–253. doi:10.1038/nrmicro2537
- Byrd AL, Belkaid Y, Segre JA. The human skin microbiome. Nat Rev Microbiol. 2018;16(3):143–155. doi:10.1038/nrmicro.2017.157
- Lambers H, Piessens S, Bloem A, Pronk H, Finkel P. Natural skin surface pH is on average below 5, which is beneficial for its resident flora. Int J Cosmet Sci. 2006;28(5):359–370. doi:10.1111/j.1467-2494.2006.00344.x
- Salem I, Ramser A, Isham N, Ghannoum MA. The gut microbiome as a major regulator of the gut-skin axis. Frontiers in Microbiology. 2018;9:1459. doi:10.3389/fmicb.2018.01459