Sodium Butyrate
A salt of butyrate — the primary short-chain fatty acid produced by colonic fermentation of dietary fibre. The main energy source for colonocytes, a potent HDAC inhibitor, and an anti-inflammatory agent with independent lifespan extension in model organisms. Supplementation delivers butyrate directly to the colon, bypassing fermentation variability.
Medical Disclaimer: The information on this page is for educational and research purposes only. It is not a substitute for professional medical advice, diagnosis, or treatment.
What Is Sodium Butyrate?
Butyrate is a 4-carbon short-chain fatty acid (SCFA) produced naturally by colonic bacteria when they ferment dietary fibre — particularly resistant starch, inulin, and pectin. It is the most physiologically significant SCFA for gut health, serving as the primary energy source for colonocytes and a powerful epigenetic regulator.
Sodium butyrate is the supplemental salt form, providing butyrate directly to the colon without requiring microbiome-dependent production. This makes it relevant even for individuals with reduced SCFA-producing bacteria capacity.
Lifespan Extension Evidence
Butyrate has demonstrated lifespan extension in multiple model organisms. In Drosophila melanogaster, dietary butyrate significantly extended median lifespan. In C. elegans, butyrate supplementation extended lifespan through DAF-16 (FOXO) pathway activation. While human lifespan data does not exist, the conserved mechanisms suggest relevance.
HDAC Inhibition: The Epigenetic Mechanism
Histone deacetylase (HDAC) inhibition is one of butyrate's most significant mechanisms. HDACs remove acetyl groups from histones, compacting chromatin and reducing gene expression. HDAC inhibition shifts gene expression toward more open chromatin states — upregulating stress response genes, autophagy genes, and anti-inflammatory pathways.
This epigenetic mechanism operates systemically — absorbed butyrate affects gene expression throughout the body, not just in the gut.
Dietary vs Supplemental Butyrate
The best approach to butyrate is dietary: 30–40g/day of diverse dietary fibre maximises colonic fermentation and butyrate production. Supplemental sodium butyrate provides 300–600mg — substantially less than the grams produced from a high-fibre diet.
However, supplemental butyrate is relevant when: dietary fibre is limited, microbiome diversity is reduced (post-antibiotics, poor diet history), or direct colonic delivery for gut repair is the primary goal.
Related Research
Stacking Interactions
How Sodium Butyrate interacts with other compounds
Safety Profile — Tier A
Well-tolerated — strong human evidence
Contraindications
- ●Sodium restriction (each 600mg capsule contains ~130mg sodium)
- ●Active colitis flare at very high doses
Side Effects
- ●Excellent safety profile — naturally occurring metabolite
- ●Unpleasant odour (butyric acid smell) — enteric-coated forms minimise this
- ●Mild GI discomfort at high doses in some individuals
- ●No serious adverse events documented at supplement doses