How we evaluated these products
We reviewed fibre supplements available on Amazon.com.au based on four criteria:
Evidence. Does peer-reviewed research support the fibre type for the claimed benefit? We prioritised fibres backed by systematic reviews and meta-analyses.
Dosing transparency. Does the product clearly state the fibre content per serving, and does that serving align with doses used in clinical research?
Ingredient purity. We favoured products with minimal additives.
Value. We calculated cost per effective daily dose in AUD, not cost per gram.
We include affiliate links to Amazon.com.au. These earn us a small commission at no extra cost to you. Our editorial choices are independent of these links. Full disclosure at /disclosure.
What is the Australian fibre gap?
The National Health and Medical Research Council (NHMRC) recommends 25g of fibre per day for women and 30g for men.1 The Australian Bureau of Statistics reports average intake of approximately 20-22g per day. Better than Europe, but still short.
Australia’s fibre gap is smaller than the European fibre gap, partly because Australian diets include more whole grains and legumes on average. But “smaller gap” does not mean “no gap.” An 8-10g daily shortfall still adds up to roughly 3kg of missing fibre per year.
For Australians on GLP-1 medications, the situation mirrors global trends. Wegovy (semaglutide) is approved by the Therapeutic Goods Administration (TGA). Ozempic is available with a PBS listing for type 2 diabetes. PBS coverage for obesity is limited, meaning many Australians pay out of pocket. The physiological effects on digestion are the same: reduced appetite, slower gastric emptying, and constipation in 5-24% of users.
Australian regulatory note: FSANZ Standard 1.2.7 governs health claims on food products. “Good source of fibre” requires 4g+ per serving. “Excellent source of fibre” requires 7g+ per serving. Products must also meet the Nutrient Profiling Scoring Criterion (NPSC) to carry health claims.
What are the main fibre types in Australian supplements?
Psyllium husk (ispaghula) is the dominant fibre type in Australia, led by Metamucil. Gel-forming, soluble, and the most studied fibre for constipation. Strong evidence for regularity and cholesterol reduction.2
Wheat dextrin is sold as Benefiber in Australia. Soluble, tasteless, dissolves completely. Weaker clinical evidence base than psyllium, but popular due to convenience.
Chicory inulin is a soluble prebiotic fibre with the strongest prebiotic evidence. The EFSA health claim for bowel function at 12g/day is the only proprietary health claim for a specific fibre source.3 Less widely available in Australia than in Europe.
PHGG (partially hydrolysed guar gum) is sold as OptiFibre and some Swisse products. Gentlest option for sensitive digestion. Low-FODMAP. Clinical evidence for IBS.4
For a detailed comparison of the two most researched types, see our chicory inulin vs. psyllium husk guide.
How to choose the right fibre supplement in Australia
If you want the most evidence-backed option: Start with psyllium husk. Available as branded or bulk powder. Australian pharmacists know it, your GP knows it, and the research supports it.
If you are on a GLP-1 medication: Consider a PHGG (Sunfiber) product. PHGG is the gentlest for GLP-1 users experiencing nausea. Once your GI symptoms stabilise, you can add inulin for prebiotic support.
If you are on a budget: Bulk psyllium husk powder is the cheapest effective option. Bulk inulin powder is the cheapest prebiotic.
If texture is a deal-breaker: Wheat dextrin dissolves completely with no taste or texture change. PHGG products also dissolve clear.
Which fibre should you choose?
If your main concern is constipation relief, start with psyllium husk powder. It has the most clinical evidence for improving stool frequency and consistency. Take with at least 250ml of water per serving. Browse psyllium husk powder on Amazon.com.au
If you are starting a GLP-1 medication (Ozempic, Wegovy, Mounjaro), consider PHGG (partially hydrolysed guar gum) or Sunfiber first. PHGG is the gentlest fibre for GLP-1 users because it produces minimal gas, dissolves completely, and is low-FODMAP certified. Avoid jumping straight to high-dose inulin in the first weeks. Browse PHGG / Sunfiber on Amazon.com.au
If you want prebiotic and microbiome support, look for chicory inulin powder. At 12g/day it carries the only proprietary EU health claim for bowel function. Start at 4g/day and ramp up over 2 weeks to avoid gas and bloating. Browse chicory inulin powder on Amazon.com.au
If you have IBS or FODMAP sensitivity, start with PHGG or acacia fibre. Both are slow-fermenting, low-FODMAP, and produce significantly less gas than inulin or psyllium. Browse acacia fibre on Amazon.com.au
If you already know your tolerance and want broader microbiome coverage, look for a fibre blend that combines two or more soluble fibres. Trade-off: if side effects occur, you cannot isolate which fibre is responsible. Browse prebiotic fibre blends on Amazon.com.au
Frequently asked questions
What is the best fibre supplement in Australia?
Psyllium husk is the most widely sold and recommended fibre type in Australia. For prebiotic support, chicory inulin powder at 12g/day has the strongest evidence. For sensitive digestion, PHGG (partially hydrolysed guar gum) products are the gentlest.
What is the most studied fibre type?
Psyllium husk has the deepest clinical evidence base for constipation relief and cholesterol reduction. Bulk psyllium husk powder is also the best value per dose. Branded versions offer convenience and pharmacy familiarity.
Can you take fibre supplements with Ozempic in Australia?
Yes. Take fibre supplements at least 1 hour before or 2 hours after your GLP-1 injection. Ozempic and Wegovy are both available through the TGA. PBS coverage for obesity is limited. Read more: Oral Wegovy and fibre: how the fasting rule changes everything.
How much fibre do Australian adults need per day?
The NHMRC recommends 25g per day for women and 30g per day for men. Most Australians consume about 20-22g. A supplement providing 5-10g per day can close most of the gap.
What is the difference between psyllium husk and wheat dextrin?
Different fibre types. Psyllium husk is gel-forming and absorbs water, adding bulk to stool. Wheat dextrin is soluble and dissolves clear with no taste. Psyllium has stronger clinical evidence for constipation. Wheat dextrin is easier to mix into foods.
Looking for fibre supplements in another market? See our guides for the US, UK, Canada, Netherlands, or Nordics.
* Affiliate link. See our disclosure for details.
This article is for informational purposes only and does not constitute medical advice. Always consult your healthcare provider before starting, stopping, or changing any medication or supplement regimen.
Last reviewed: April 7, 2026. Prices and availability are approximate and may change.
Footnotes
-
National Health and Medical Research Council (2013). Australian Dietary Guidelines. Canberra: NHMRC. ↩
-
Wei ZH, Wang H, Chen XY, et al. (2009). Time- and dose-dependent effect of psyllium on serum lipids. European Journal of Clinical Nutrition, 63(7):821-827. ↩
-
EFSA Panel on Dietetic Products, Nutrition and Allergies (2015). Scientific Opinion on the substantiation of a health claim related to “native chicory inulin” and maintenance of normal defecation by increasing stool frequency. EFSA Journal, 13(1):3951. ↩
-
Giannini EG, Mansi C, Dulbecco P, Savarino V (2006). Role of partially hydrolyzed guar gum in the treatment of irritable bowel syndrome. Nutrition, 22(3):334-342. ↩