Butyrate (Butyric Acid)

CompoundUseful

A short-chain fat your gut bacteria make from fiber. It's the main fuel for your colon.

At a glance

Feed it with fiber

Fuels the colon Colon cells burn butyrate as their main energy source. why ↓
Strengthens the gut lining Helps keep the barrier between gut and bloodstream tight. why ↓
Calms immune signaling Changes gene activity in immune cells to dial down inflammation. why ↓

Strong human evidenceEarly / limited

How to take it

Eat fermentable fiber: lentils, black beans, oats, barley, onion, garlic
Cooled potatoes or rice add resistant starch
Butter and ghee supply a little directly

Watch out

Add fiber gradually, or expect bloating and gas

The Research

Mechanisms, studies and evidence grades for each claim above.

Functions

Primary fuel for colon cells
Supports gut barrier integrity
Immune modulation

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Mechanism

Acts through SCFA receptors (GPR41/43/109A) and via HDAC inhibition, which affects gene expression in colon and immune cells.

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Intake

No established RDA — butyrate isn't consumed directly in meaningful amounts so much as produced in the gut. The lever is sufficient fermentable fiber and resistant starch to support microbial SCFA production; individual tolerance varies.

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Deficiency effects

No classic deficiency syndrome, but low fiber intake and correspondingly low SCFA production is associated with poorer gut barrier and inflammatory profiles in some settings.

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Downsides

Increasing fermentable fiber too quickly to boost butyrate production can cause bloating and gas.

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Top foods

Legumes that generate butyrate on fermentation (e.g., lentils, black beans)
Oats and barley
Onion and garlic
Resistant starch — cooled potatoes or rice
Butter/ghee — small direct amounts

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Source page has no linked citations for this entry — the mechanism above is from the page's own summary text, not individually sourced.