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Acacia fibre (gum arabic)

A soluble prebiotic that's remarkably easy on the gut — slow to ferment, so little gas.

Reviewed by Bodil Isaksson, Licensed Biomedical Scientist (Sweden)Last reviewed July 2026Supplement guide

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Acacia fibre (gum arabic) is the dried sap of the acacia tree. It dissolves completely and ferments slowly, which is why it causes far less gas than inulin.

Key takeaways

  • A mild prebiotic — gently raises bifidobacteria and lactobacilli.
  • Exceptionally well tolerated — studies show good tolerance up to ~30 g/day.1
  • Dissolves clear and tasteless; easy to add to drinks.
  • A good option if inulin/FOS give you too much bloating.

What it is

A complex soluble polysaccharide from acacia sap. It’s fully soluble and fermented gradually along the colon, so gas is produced slowly rather than in a rush.

The evidence

Tolerance studies show acacia is comfortable up to ~30 g/day, far higher than most fermentable fibres, while still exerting a prebiotic effect on the microbiome.1 Evidence for cholesterol/metabolic effects is preliminary.

Dose

5–15 g/day is typical; it’s tolerated well above that. Stir into water or food.

Safety

Among the gentlest fibres. Mild gas at high intakes only. Take with fluid.

Bottom line: the easy-going prebiotic — excellent tolerability makes it a fine choice for sensitive guts, though it’s not a cholesterol powerhouse.

References

Adult research summary for education, not a prescription.

  1. Calame W, et al. Gum arabic establishes prebiotic functionality in healthy humans in a dose-dependent manner. Br J Nutr 2008. pubmed.ncbi.nlm.nih.gov

This article summarises nutrition science for education. It is not a substitute for individual medical advice; consult a professional before starting a supplement, in pregnancy, or alongside medication.