Sodium butyrate is a supplemental form of butyric acid, a short-chain fatty acid that your gut bacteria produce naturally when you eat fiber-rich foods. It serves as the primary fuel source for the cells lining your colon, keeping them healthy and your gut barrier tight. As a supplement, it delivers butyrate directly — useful when diet or gut bacteria aren't producing enough on their own.

The cells that line your colon (colonocytes) run almost entirely on butyrate for energy. When butyrate levels are adequate, these cells stay strong and tightly packed, preventing harmful substances from leaking into the bloodstream — a concept often called gut barrier integrity. Butyrate also signals immune cells in the gut to stay calm, which helps reduce chronic low-grade inflammation throughout the digestive tract.

Enteric-coated and microencapsulated capsules are the gold standard because they protect the compound through the stomach and release it in the colon. Plain powder or uncoated capsules release butyrate too early and have a very strong, rancid-butter odor that many people find difficult to tolerate.

• Leaky gut (intestinal permeability)
• IBS (irritable bowel syndrome)
• Ulcerative colitis
• Crohn's disease
• Gut inflammation
• Constipation
• Brain fog and neuroinflammation
• Insulin resistance and blood sugar balance
• Colon cancer risk reduction

• Colorectal cancer risk — higher colonic butyrate levels are consistently linked to reduced colorectal cancer incidence in epidemiological research
• IBD flare recurrence — clinical evidence supports butyrate as a maintenance strategy to reduce relapse frequency in ulcerative colitis

• Butter and ghee — Among the very few direct dietary sources of butyric acid — ghee and butter naturally contain butyrate as part of their fat profile, though amounts are modest compared to what gut bacteria produce from fiber
• High-fiber legumes (lentils, chickpeas, black beans) — Legumes are rich in fermentable fiber that gut bacteria convert into butyrate in the colon — consistently the best dietary strategy for raising butyrate levels
• Whole oats and barley — Contain beta-glucan, a highly fermentable fiber that strongly stimulates butyrate production by colonic bacteria
• Cooked and cooled potatoes and rice (resistant starch) — Cooling cooked starchy foods creates resistant starch, one of the most potent substrates for butyrate-producing bacteria — a practical and accessible dietary hack
• Garlic, onions, and leeks — Rich in inulin and fructooligosaccharides — prebiotic fibers that selectively feed butyrate-producing bacteria like Faecalibacterium prausnitzii

• Strong, rancid-butter odor (mostly with uncoated powder or capsules)
• Mild nausea or stomach discomfort, especially when starting
• Loose stools or increased gas at higher doses
• Burping or reflux with non-enteric-coated forms
• Rare: headache when first starting, typically resolves within days

• Recommended daily: 300–600 mg per day for general gut health; up to 150–300 mg per kg body weight per day has been used in clinical IBD studies (clinical use — consult a practitioner for higher doses)
• Best time of day: With meals — typically split into 2 doses with breakfast and dinner
• With or without food: Take with food to reduce any gastric discomfort and improve tolerability
• Time to effect: 2–4 weeks for initial digestive comfort; 6–12 weeks for measurable gut barrier and inflammatory improvements
• How long to take it: Can be taken continuously for chronic gut conditions. For general maintenance, some practitioners cycle 8–12 weeks on with a 4-week break while maintaining a high-fiber diet. Long-term daily use appears safe based on available human data.