# Butyrate

Butyrate is a four-carbon short-chain fatty acid (SCFA), made in your colon when anaerobic bacteria ferment dietary fiber. The main producers are Faecalibacterium prausnitzii and Roseburia intestinalis. Butyrate enters the cells lining your colon (via transporters called MCT1/4) and gets burned in their mitochondria. In fact, it supplies roughly 70 to 80% of those cells' energy, their dominant fuel. But butyrate does more than feed them. It blocks gene-silencing enzymes (class I/II HDACs), which raises the activity of genes for tight junctions (claudin-1, occludin) and anti-inflammatory signals. That reinforces your gut barrier and dampens NF-κB-driven cytokines (IL-6, TNF-α, IL-1β). Chang et al. (2014, PNAS) showed in cells and mice that butyrate blocks HDAC activity in gut immune cells (macrophages), sharply reducing LPS-driven inflammation. In aging, gut dysbiosis depletes the butyrate-makers, lowering butyrate and feeding inflammaging. Rees et al. (2025, Aging Cell) classified butyrate as a 'senomorphic': in aged human T cells in a dish, it suppressed SASP markers and cut IL-6 and IL-8. Trials in inflammatory bowel disease show it is tolerable with modest mucosal benefit; randomized longevity-endpoint trials in healthy adults are absent as of 2026. Overall, butyrate is best seen as a plausible link between fiber, the microbiome, and healthspan, not a proven anti-aging therapy.

## Sources

- Chang PV, Hao L, Offermanns S, Medzhitov R. (2014). The microbial metabolite butyrate regulates intestinal macrophage function via histone deacetylase inhibition. Proceedings of the National Academy of Sciences. https://doi.org/10.1073/pnas.1322269111
- Gasaly N, Hermoso MA, Gotteland M. (2021). Butyrate and the Fine-Tuning of Colonic Homeostasis: Implication for Inflammatory Bowel Diseases. International Journal of Molecular Sciences. https://doi.org/10.3390/ijms22063061
- Louis P, Flint HJ. (2017). Formation of propionate and butyrate by the human colonic microbiota. Environmental Microbiology. https://doi.org/10.1111/1462-2920.13589
- Rees NP, Conway J, Dugan B, Amir SS, Parker A, Carding SR, Duggal NA. (2025). Defining Microbiota-Derived Metabolite Butyrate as a Senomorphic: Therapeutic Potential in the Age-Related T Cell Senescence. Aging Cell. https://doi.org/10.1111/acel.70257

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_Canonical: https://longevity-switzerland.com/en/glossary/butyrate · Part of Longevity Cities · Updated 2026-06-22_