Vaginal microbiome: the intimate microbiome explained

The vaginal microbiome is the community of microorganisms that lives on and around vaginal and vulvar tissue. It is a type of microbiome — one of the many…

What is the vaginal microbiome?

The vaginal microbiome is the community of microorganisms that lives on and around vaginal and vulvar tissue. It is a type of microbiome — one of the many microbial communities the human body hosts — and, like the others, it is a normal and expected part of healthy anatomy rather than something to be scrubbed away. The terms vaginal flora, intimate microbiome, and vaginal microbiota all describe the same community. A 2018 overview of the vaginal microbiome describes its structure and function as a distinct microbial ecosystem.

What sets this ecosystem apart is captured in its defining attributes. Its species diversity is low compared with, say, the gut — and in this case low diversity is the healthy state. That is because of Lactobacillus dominance: the community is typically ruled by a handful of Lactobacillus species. A 2022 study on host and microbiome interplay in the vaginal microenvironment describes exactly this — a low-diversity, Lactobacillus-dominated community. The healthy vaginal flora, in other words, is not a crowded jungle but a well-ordered one.

How the vaginal microbiome works

The intimate microbiome is made of Lactobacillus species alongside other commensal bacteria, and the metabolites those microbes produce. The relationship between them is what shapes the environment. A 2018 review of the physiologic role of lactobacilli describes how these bacteria metabolize the breakdown products of glycogen into lactic acid, and that lactic acid is a large part of why the surface environment tends to stay mildly acidic. This is the background biology behind intimate microbiome balance — a self-sustaining loop of substrate, bacteria, and acid.

A third attribute, pH dependence, follows directly. The acidity the lactobacilli produce is bound up with the community that produces it, so the two move together as background physiology. The vaginal microbiome requires glycogen as a substrate — the branched sugar that feeds those bacteria — and you can read more about that molecule and its role on the glycogen reference.

What affects the vaginal microbiome

The vaginal microbiome is affected by menopause. As educational background, the drop in estrogen around the menopausal transition reduces the epithelial glycogen that feeds lactobacilli, and the community can shift as a result. A 2022 review of the postmenopausal vaginal microbiome describes how estrogen drives epithelial glycogen and how its decline alters the microbiome. This is context about the body’s own biology — not a claim that any product changes it.

It is worth being clear about scope. A leave-on cosmetic applied to external skin is not a treatment for the microbiome, and nothing here should be read that way. This tissue is delicate external skin, and an external vaginal moisturizer supports the comfort of that surface skin. The microbiome science on this page is background education about how intimate biology works, kept separate from what a cosmetic does.

Balance versus imbalance

The antonyms sharpen the picture. A sterile environment is not the goal — a healthy intimate microbiome is populated, not empty. At the other extreme is dysbiosis, a loss of the usual Lactobacillus dominance that shifts the community out of its low-diversity, acidic pattern. Healthy vaginal flora sits between those poles: a stable, low-diversity community whose connotations are balance and health. Understanding that spectrum is what makes intimate microbiome balance an educational topic rather than something a skin product acts on.

Frequently asked questions about the vaginal microbiome

What is the vaginal microbiome made of?

It is a community of Lactobacillus species, other commensal bacteria, and the metabolites they produce. Background reviews describe it as low-diversity and Lactobacillus-dominated — the healthy vaginal flora is orderly rather than crowded.

Why does the vaginal microbiome matter?

Its lactobacilli metabolize glycogen breakdown products into lactic acid, which is tied to the mildly acidic surface environment. That is background biology describing how the intimate microbiome shapes its own conditions, not a product claim.

Can a moisturizer change the vaginal microbiome?

An external leave-on cosmetic is applied to the outer skin to support surface comfort; it is not a microbiome treatment and does not restore, rebalance, or fix the microbiome. The microbiome information here is educational background, kept separate from what a cosmetic does.

How does menopause affect the vaginal microbiome?

As background physiology, lower estrogen reduces the epithelial glycogen that feeds lactobacilli, so the community can shift. This is driven by the body’s own hormones — context for why intimate biology changes across life stages.

Era Organics and the vaginal microbiome

Era Organics’ Certified Organic Vaginal Moisturizer is a leave-on cosmetic balm for the delicate external skin of the vulva. It is designed to help soothe and hydrate that surface skin and support everyday external comfort. It does not treat, restore, or rebalance the vaginal microbiome — that biology is included here purely as education. The balm is USDA Organic, COSMOS Standard compliant, fragrance-free, and cruelty-free.

It suits people across life stages, from teens to menopausal, including pregnant and nursing moms, and is applied as a dime-sized amount to clean, dry external skin. Patch test first. For the full formula and how the balm supports external intimate comfort, see the Era Organics Vaginal Moisturizer hub, or browse the collection of organic vaginal moisturizers.