What Is the Microbiome? From Buzzword to Biological Engine

The word microbiome is everywhere, from conference stages to health podcasts. But the word is often misunderstood.

Strictly speaking, a microbiome is the ecosystem formed by a collective community of microorganisms, including bacteria, viruses, fungi and archaea, including their genetic material, that inhabits a specific environment.

In common use, however, the term usually refers to the collection of microbial communities and their genetic material that live in and on the human body. That’s what the microbiome is.

The human gut microbiome alone harbors trillions of microbes, about as many as  human cells, with a collective genetic repertoire exceeding the human genome by over 100 times. This vast “second genome” orchestrates daily physiological processes far beyond digestion.

Learn more about the human microbiome

What Is the Microbiome? Not Just Microbes

Note that the definition includes not only the microbes themselves, but also the total functional capacity encoded in their genomes. In other words, it’s not only which microbes are present but also what they are doing, what functions they perform.

What is the microbiome? It’s the collection of ecosystems inhabiting nearly every part of the human body: our guts, skin, oral cavities, eyes, vaginal cavities, respiratory tracts and more. It’s a cadre of microbes, all playing essential roles in metabolic health, immune system support and nutrient production.

These microbial communities don’t simply coexist with us: They actually coevolved with us. Their functions are essential to human survival. They:

• Extract energy from otherwise indigestible food, an ability that may have provided more usable energy during human evolution
• Produce critical nutrients such as vitamin K and specific B vitamins
• Support and train the immune system, especially in infants
• Modulate brain function via the gut-brain axis, influencing mood, stress response and cognitive health
• Influence metabolic health and gut integrity

For companies operating in the health, nutrition and wellness space, these biological insights are more than scientific curiosities. They represent one of the most powerful innovation frontiers of the next decade. To them, that’s what the microbiome is.

As this understanding deepens, the probiotic industry is undergoing its own revolution, from generic strain lists to precise mechanism-targeted solutions.

Beyond the Strain List: Why Function Matters

The probiotic marketplace is crowded, and many products rely on lists of bacterial strains paired with broad, often nonspecific claims. But modern microbiome science is shifting from asking “What is the microbiome?” to asking “What do those strains actually do?”

This functional lens focuses on the metabolic activity of microbes. Specific bacteria produce metabolites that interact with the human host and trigger measurable physiological effects. As the science becomes more sophisticated, functional validation—beyond strain identity—is becoming the true indicator of product quality.

This shift opens significant opportunities for B2B partners seeking to differentiate through:

• Demonstrated mechanisms of action: For instance, specific strains produce short-chain fatty acids that strengthen the gut barrier and reduce inflammation.
• Claims supported by clinical data: Rigorous human trials that measure biomarkers, not just self-reported outcomes.
• Clear scientific narratives: Storytelling backed by omics data showing pathway-level interactions.

From Association to Efficacy: A Higher Standard for Microbiome Innovation

For years, much of microbiome research focused on observational links and the identification of microbial strains that are found in healthy people. In those days, that’s all you needed to know what the microbiome is.

Today, the field has matured. The gold standard now includes:

• Isolating specific strains
• Identifying their functional capacities
• Mapping the metabolites they produce
• Evaluating mechanisms in controlled biological models

This rigorous approach reduces risk for brands, improves reproducibility and strengthens product storytelling. The shift not only mitigates regulatory scrutiny but also builds consumer trust in an era of heightened demand for evidence-based wellness.

See how probiotics research strengthens health

How IFF Health Sciences Is Leading This Shift

In a market flooded with commodity probiotics, IFF Health Sciences brings foundational probiotic expertise, as embodied in the clinically mastered HOWARU® portfolio, with pioneering next-generation probiotics. NGPs represent commensal microbes (like proprietary strains of Akkermansia) that coevolved with humans, offering targeted modulation of metabolic pathways, immunity and beyond.
For B2B partners, leveraging microbiome science goes far beyond accessing novel strains. That’s not what the microbiome is about anymore. It’s about embracing a systems-level approach that delivers scientifically robust, commercially scalable and globally differentiating solutions.

Next-Generation Microbes

IFF Health Sciences leads this evolution through the Next Generation Probiotics (NGP) platform and advanced discovery workflows. These support the identification and development of function-driven strains that target specific mechanisms, moving the industry from broad associations to proven efficacy.

A Functionality-First Approach

IFF Health Sciences employs proprietary methods for identifying and isolating function-driven strains, drawing from one of the industry’s largest strain libraries and leveraging high-throughput screening to isolate function-first candidates. This functionality-first selection prioritizes strains with defined metabolic activities and targeted health benefits, shortening development timelines and increasing the reliability of outcomes in areas like metabolic health, immunity and gut integrity.

Tracking Microbe Functions

High-resolution bioinformatics further powers this by characterizing microbial metabolic output in exceptional detail: mapping genes, pathways and key metabolites that drive host interactions. This genomics-backed insight predicts and optimizes physiological effects, providing transparent, evidence-based narratives that help partners build credible claims and stand out in a crowded market.

Ensuring Efficacy and Safety

IFF Health Sciences reduces the risks of innovation by conducting rigorous evaluations in controlled model systems, including in vitro simulations and preclinical models. These test strain efficacy, safety and reproducibility under biologically relevant conditions, catching challenges early and paving a clearer path to human clinical validation, elevating standards and ensuring regulatory alignment.

From Lab to Market

IFF Health Sciences’ scalable production capabilities serve to close the loop from lab concept to global commercialization. Leveraging advanced fermentation, encapsulation, formulation technologies and comprehensive stability and manufacturability programs, we deliver consistent, high-quality, shelf-stable NGPs and probiotic solutions ready for market demands.

A Supportive Ecosystem

This integrated platform allows brands to launch standout products backed by mechanism-led science. Partners gain not just innovative ingredients but a full ecosystem of support that promises to accelerate time-to-market, strengthen competitive positioning and capture growth in the evolving health and nutrition landscape.

This end-to-end ecosystem, which combines R&D pipelines, regulatory know-how and formulation expertise, empowers IFF Health Sciences partners to reduce the risk of launches, accelerate market entry and capture premium positioning in metabolic health, immunity and emerging categories like gut-brain support. Partnering with IFF Health Sciences can help brands advance microbiome-powered innovation, turning cutting-edge science into measurable business value.

Partner with IFF Health Sciences to advance microbiome innovation

What is the Microbiome and What Will the Next Generation of Microbiome-Powered Products Look Like?

Microbiome science has evolved from descriptive biology to precision innovation.

Organizations that adopt a mechanism-led approach will lead the next decade of health and nutrition development.

Science-driven probiotic and microbiome innovation starts with choosing the right partner. In a decade where mechanism-led innovation will separate leaders from followers, IFF Health Sciences offers the proven track record and forward pipeline to help your brand pioneer the future.

Ready to explore what’s possible? Connect with IFF Health Sciences for expert support in probiotic development, next-generation strains and end-to-end manufacturing solutions.

What Is the Microbiome and Other Questions

What is the microbiome in simple scientific terms?

The microbiome refers to the full collection of microorganisms and their genetic material that live in and on the human body. It includes bacteria, fungi and other microbes, as well as the genes that determine their metabolic activity.

What is the difference between microbiome and microbiota?

Microbiota refers only to the microorganisms themselves. That’s not what the microbiome is. The microbiome refers to the entire habitat, including the microorganisms (bacteria, archaea, lower and higher eukaryotes, and viruses), their genomes (genes) and the surrounding environmental conditions.

How does the gut microbiome affect metabolic health?

The gut microbiome produces metabolites that influence nutrient absorption, satiety signals, movement of the intestine,  the body’s response to inflammation and other metabolic signaling pathways. These interactions can impact metabolic health and systemic physiological responses.

Why has mechanism of action gained traction in microbiome research?

Mechanism of action demonstrates how a specific strain produces measurable effects through defined biological pathways. This strengthens clinical validation and supports credible health claims.

How are probiotic strains clinically validated?

Clinical validation involves a range of testing including in vitro and animal studies followed by human clinical trials to confirm safety, efficacy and reproducibility.