Understanding SCFA (Total): Normal vs Optimal Ranges

?What is SCFA (Total)?

Short-chain fatty acids (SCFAs) are fermentation products produced by gut bacteria from dietary fibre. The main SCFAs are acetate, propionate, and butyrate. They serve as fuel for colonocytes, regulate immune function, maintain gut barrier integrity, and have systemic metabolic effects including reducing inflammation and modulating insulin sensitivity.

!Why It Matters

Low total SCFA production indicates insufficient prebiotic fibre intake and/or reduced microbial diversity. Low SCFAs are associated with increased intestinal permeability, reduced colonocyte health, increased inflammation, and higher risk of colorectal cancer. Butyrate is particularly important as the primary energy source for colon cells and a potent anti-inflammatory and anti-cancer molecule.

Reference Ranges

Lab normal ranges may vary between laboratories. Optimal and longevity targets are based on research literature and should be interpreted with your physician.

Symptoms of Imbalance

• Low SCFA: constipation, poor gut barrier function, increased inflammation
• Abdominal discomfort, irregular bowel habits

How to Improve Your Levels

• 1Increase dietary fibre to 30-50g/day from diverse plant sources
• 2Consume resistant starch: cooked and cooled rice/potatoes, green bananas, legumes
• 3Fermented foods (yogurt, kefir, kimchi) support microbiome diversity
• 4Prebiotic supplements (inulin, FOS, psyllium) boost SCFA production

When to Test

As part of gut microbiome stool analysis; gut barrier and microbiome health assessment.

Related Biomarkers