Clostridia Cluster XVIII is part of the larger Clostridia class, a diverse group of bacteria involved in gut health, metabolism, and immune function. Many species within Cluster XVIII are beneficial and play important roles in maintaining gut homeostasis. They contribute to the production of short-chain fatty acids (SCFAs)—particularly butyrate—which supports colon health, reduces inflammation, and strengthens the intestinal barrier.
Balanced levels of Clostridia Cluster XVIII are associated with healthy immune regulation, reduced inflammatory signaling, and improved gut microbiome diversity. Low levels may indicate reduced SCFA production, dysbiosis, diet-related imbalances, or recent antibiotic exposure. Higher-than-expected levels may occur during microbial shifts, overfermentation, or imbalance with other bacterial groups.
On the Gut Zoomer panel, Clostridia Cluster XVIII helps provide insight into the functional health of the gut ecosystem, particularly in relation to inflammation, digestive efficiency, and microbiome stability.
Clostridia clusters XVIII
Every lab result you’ve ever had, charted and explained.
Healthmatters is a tracker for your lab results. Upload a report from any lab, any country — every marker charted and explained.
Start with my report →
All our content is backed by peer-reviewed studies, academic research, and trusted medical sources. We’re committed to accuracy and transparency — see our editorial policy for details.