Microbiome-friendly, prebiotic, postbiotic—the vocabulary is soft science until you pin it to a measurable endpoint.
Recent guidance discussions in the EU and US market emphasize that microbiome claims should not imply disease treatment, and that “supports healthy flora” still needs a factual basis tied to the finished formula.
Many launches rely on ingredient-level in vitro data. That rarely transfers cleanly to an on-skin ecological claim without clinical or at least ex vivo microbiome readouts.
For claim ops: flag microbiome language early, require the evidence artifact (study PDF or internal report), and record whether the claim is about the ingredient or the finished product.