Roseburia
Roseburia is a genus of fiber-fermenting bacteria in the Firmicutes phylum and a notable producer of butyrate. Its members are motile and thrive on the plant fibers you eat.
As a butyrate producer, Roseburia contributes fuel for the cells lining your colon and is often studied as part of a healthy, fiber-fed community. Lower levels have been observed alongside some gut and metabolic conditions.
A higher share of Roseburia is generally framed favorably, reflecting a good presence of fiber-fermenting, butyrate-making microbes. Because this is a relative reading from one sample, it is a supportive signal rather than a diagnosis.
A lower share is sometimes seen with lower-fiber diets or alongside certain conditions in research, but a single reading does not diagnose anything on its own.
The main lever is a varied, fiber-rich diet that feeds these microbes. Given the youth of this science, treat your level as a trend to support over time and discuss with a clinician.
Sources
Educational context only, not medical advice or a diagnosis. Reference ranges vary by lab, age and sex; always discuss your results with a clinician.