In the absence of regulation specifically dedicated to the skin microbiome, several laboratories have developed their own private certifications to help brands communicate about respecting the microbiome. A useful marketing tool, but one that should not be confused with regulatory certification. Here is how these labels work, what protocols they rely on, and how to assess their rigor before committing to one.
A landscape of private labels, in the absence of a dedicated regulatory framework
Several laboratories have created in-house certifications, such as “microbiome-friendly,” “respect the microbiome,” “kind to biome,” or “maintains the microbiome,” to help cosmetic brands demonstrate that their products do not harm the skin microbiome. Each organization uses its own protocols, in vitro and/or in vivo, or a combination of both, mainly to verify that a given product does not have a detrimental effect on microbial balance.
An essential point of caution for regulatory and marketing teams: as of today, there is no specific global regulation in place governing cosmetic products or ingredients targeting the skin microbiota. The cosmetics industry is nonetheless still required to comply with standard regulations applicable to safety and claims. Future regulatory harmonization of these labels is likely, aiming for greater transparency for consumers, but it has not yet been formalized.
These certifications are therefore primarily a marketing tool and a mark of consumer confidence, not the equivalent of strict regulatory certification. This distinction should be explicitly understood internally before any communication, to avoid any risk of confusion with legal compliance.
What protocols underpin these certifications
Depending on the certifying laboratory, the demonstration relies on in vitro, ex vivo, or in vivo protocols, each with its own advantages and limitations, which are worth knowing before choosing a certification partner.
| Protocol basis | What it allows | Advantages | Limitations |
|---|---|---|---|
| In vitro | Determine whether the product affects specific bacterial strains | Controlled, reproducible environment, fast and affordable | Narrow view of the microbiome, strain isolated from other bacteria |
| In vitro / ex vivo | Intermediate approach combining experimental control and tissue context | Compromise between feasibility and biological relevance | Does not fully reproduce in vivo complexity |
| In vivo | Meaningful conclusions on how the product interacts with the entire microbiome at the site of application | Overall view of the microbiome, observation of interactions between bacteria | High inter-individual variability, long and costly protocol |
The choice of underlying protocol directly shapes the scientific credibility of the claimed label: a certification based solely on rapid in vitro screening does not carry the same evidentiary weight as one backed by a full in vivo study.
How to assess the rigor of a certification before committing
Before adopting a microbiome label for a product, it is advisable to check several points with the certifying body: the exact nature of the protocol used (in vitro, ex vivo, in vivo, or a combination), the number of strains or subjects tested, whether a placebo control was included, and the transparency of the underlying data behind the final claim. These elements make it possible to distinguish a label genuinely grounded in solid scientific evidence from a marketing argument with little backing, a risk that is all the higher in a landscape still lacking a harmonized regulatory framework.
To identify laboratories offering microbiome certification protocols and understand their exact methodology, the Skinobs platform references specialized providers.
Discover skin microbiome testing solutions on Skinobs → https://www.skinobs.com/
