First came probiotics, inspired by gut health science and the growing recognition that the skin is home to a thriving ecosystem of bacteria, fungi, and viruses. With roughly 102-107 microbial cells per cm2 of skin, this complex community plays a central role in barrier integrity, inflammation control, and immune signaling.
Soon after, postbiotics emerged as a practical formulation alternative. Instead of live microorganisms, these ingredients deliver the bioactive metabolites produced during fermentation, such as organic acids, peptides, enzymes, and polysaccharides. These compounds can strengthen barrier function, modulate inflammation, and support microbial balance while remaining stable in conventional cosmetic formulas.
For formulators, this shift solved several practical challenges. Live probiotics are notoriously difficult to stabilize in topical formulations and often raise regulatory or preservation concerns. Postbiotic derivatives, by contrast, are non-viable yet biologically active, making them easier to integrate into products without compromising shelf life.
But innovation rarely stands still. Today, the conversation is evolving once again, moving beyond probiotics and even postbiotics toward a more refined concept: metabiotics.
Instead of delivering microbial fragments or lysates, metabiotic systems focus on defined metabolic outputs generated through controlled fermentation processes. In other words, rather than introducing microbes or crude ferments, formulators are now working with precisely engineered metabolite networks designed to mimic the biochemical signals naturally produced within the microbiome. This shift reflects a deeper understanding of microbial communication. Skin cells do not primarily interact with bacteria themselves. They respond to the molecules microbes produce.
And that realization is opening the door to a new generation of metabolically engineered cosmetic actives.
Fermentation has long been used in cosmetics to transform natural substrates into more bioavailable ingredients. During fermentation, microorganisms enzymatically break down complex compounds into smaller molecules such as amino acids, organic acids, short-chain fatty acids, and peptides.
However, traditional fermentation can often produce broad, variable mixtures. The emerging frontier is precision fermentation, where microbial strains, substrates, and process parameters are designed to generate specific metabolic outputs. This is where metabiotic technology distinguished itself. Rather than relying on isolated actives that target a single pathway, metabolite-based systems are designed around network biology. The goal is to recreate the type of molecular signaling environment that naturally exists within human microbiomes.
In living ecosystems, microbes communicate with host cells and neighboring microbes through metabolites. These small molecules act as biochemical messengers, regulating immune responses, maintaining barrier homeostasis, and shaping microbial community structure.
Applying this principle to cosmetic science means designing ingredients that function less like a single active compound and more like a metabolic ecosystem.
One example of this approach is SETHIC OPTIMEALTH® SUPER METABIOTICS™, a metabiotic complex produced through controlled multi-strain fermentation designed to emulate the metabolic diversity of human digestion.
Instead of delivering a single molecule, the system generates a rich spectrum of microbial metabolites, forming a biologically active network capable of interacting with skin cells and resident microbiota. This type of metabolic complexity mirrors the way biological systems actually function. In the human body, beneficial effects rarely arise from one isolated compound. They emerge from dynamic molecular interactions between multiple signaling molecules.
From a formulation perspective, this shift is significant. It represents a move away from the industry’s traditional “single hero ingredient” model toward metabolite ecosystems that support holistic microbiome balance. Clinical validation across multiple product formats further supports this approach, demonstrating measurable improvements in parameters such as skin comfort, microbiome resilience, and overall skin condition.
For formulators seeking scientifically credible microbiome solutions, metabolite-driven technologies provide a promising bridge between biological complexity and formulation practicality.
The microbiome conversation in cosmetics initially focused on facial skincare, but it quickly became clear that every surface ecosystem of the body hosts its own microbial community. Each microbiome operates as a distinct yet interconnected biological system.
Metabiotic technologies like SETHIC OPTIMEALTH® SUPER METABIOTICS™ are designed with this multi-microbiome perspective in mind, allowing a single metabolic platform to support a range of applications across beauty and personal care categories. Within this platform, specific product variants are mapped to each application to simplify selection and claims alignment: OPTIMEALTH 10W (skin care and scalp care), OPTIMEALTH 100 (oral care and intimate care), and OPTIMEALTH FOOD P500 (gut care and gut–skin care).
The skin microbiome functions as a first line of biological defense, helping regulate immune responses, maintain the acid mantle, and prevent colonization by opportunistic pathogens. Microbial metabolites play a key role in this ecosystem. Certain compounds produced by commensal bacteria can:
SETHIC OPTIMEALTH 10 W works by delivering a complex metabolite network that mimics these natural microbial signals. These metabolites interact with keratinocyte receptors and microbial communication pathways, helping to support the skin’s homeostatic balance. Instead of targeting a single biochemical pathway, the ingredient provides multi-target support, encouraging conditions that allow beneficial microbes to thrive while discouraging dysbiosis.
The scalp represents one of the most metabolically active microbiome environments on the body. Sebum-rich conditions create a habitat where microorganisms such as Malassezia yeasts and commensal bacteria compete for nutrients. When this balance shifts, it can lead to scalp conditions including dandruff, irritation, and microbial overgrowth.
Rather than functioning as a direct antimicrobial agent, OPTIMEALTH 10W helps re-establish ecological balance within the scalp microbiome. This allows beneficial microbial communities to stabilize while reducing the environmental conditions that promote dysbiosis.
The oral cavity hosts one of the most complex microbial communities in the human body, with more than 700 bacterial species forming highly structured biofilm ecosystems. Maintaining balance within this microbiome is essential for oral health. Dysbiosis can contribute to issues such as plaque formation, inflammation, and microbial imbalance.
SETHIC OPTIMEALTH 100 introduces beneficial metabolic signals that help support microbial equilibrium without disrupting the natural oral flora. Unlike aggressive antimicrobial approaches that indiscriminately eliminate bacteria, metabolite-based strategies encourage microbial balance through ecological signaling.
The intimate microbiome, particularly the vaginal microbiota, is dominated by Lactobacillus species, which help maintain an acidic pH and protect against opportunistic pathogens. Disruptions to this ecosystem can occur due to hormonal changes, environmental factors, or aggressive cleansing products.
Through its multi-metabolite composition, SETHIC OPTIMEALTH 100 supports the natural metabolic signals associated with microbiome equilibrium. Because the ingredient is cell-free and metabolically active, it provides microbiome support without introducing live microorganisms into sensitive formulations.
Recent research continues to highlight the complex relationship between gut microbiota, systemic inflammation, and skin health, commonly described as the gut–skin axis. Microbial metabolites are believed to play a major role in this communication network, acting as systemic signaling molecules that influence immune function and inflammatory pathways.
While topical cosmetics do not directly alter gut microbiota, metabolite-focused technologies align with this emerging paradigm by emphasizing biological signaling molecules rather than microorganisms themselves.For ingestible and nutrition-adjacent formats addressing gut care, as well as topical or hybrid concepts connected to the gut–skin axis, this corresponds to OPTIMEALTH FOOD P500.
In this sense, metabiotics represent a conceptual bridge between topical microbiome care and systemic microbiome science, reflecting a broader shift toward metabolic health in beauty innovation.
The evolution from probiotics to postbiotics and now metabiotics reflects a broader shift in cosmetic science. Rather than focusing solely on introducing microorganisms, formulators are beginning to work directly with the molecular language of the microbiome: metabolites.
This approach offers several key advantages:
More importantly, metabolite-driven technologies align with the biological reality that microbial ecosystems operate through networks of signaling molecules rather than isolated components.
As microbiome science continues to mature, the future of beauty innovation may not lie in adding more microbes to formulations, but in engineering the metabolic environments that support healthy microbial ecosystems.
Interested in learning more about SETHIC OPTIMEALTH® SUPER METABIOTICS™? Request your samples on Covalo!
If you’re attending in-cosmetics Global, make sure to visit Sethic at stand #2K68!
💡 Covalo tip: To learn more about microbiome skin formulations at in-cosmetics Global 2026, you can attend “Advancing Personal Care Claims with Integrated Human and Microbiome Data”.