Fibre Supplements Ireland: Inulin, Psyllium, PHGG and How to Choose
Most adults in Ireland fall short of the recommended daily fibre intake. This guide explains how much fibre you need, the difference between soluble and insoluble fibre, the main supplement types (inulin, psyllium, PHGG and resistant maltodextrin), what each one is, and how to start without discomfort.
Dietary fibre is a group of plant carbohydrates the body does not fully digest. The European Food Safety Authority (EFSA) sets the adequate intake for adults at 25 g of fibre per day, and most of that should come from food. A fibre supplement adds a measured amount of one specific fibre — usually a soluble fibre such as inulin, psyllium husk or PHGG — on top of a varied diet. In Ireland these are food supplements regulated by the FSAI, not medicines, and only authorised EU health claims may be made, each tied to one fibre at a defined daily dose. What a supplement does not do is replace a fibre-rich diet, and adding fibre too fast can cause temporary gas or bloating. Healthy Origins Sunfiber PHGG (225g, €25.95) and a range of inulin, psyllium and prebiotic fibres ship next-day from Dublin, free over €75.
Dietary fibre (roughage) definition: dietary fibre is a group of carbohydrates — found in wholegrains, vegetables, fruit, pulses, nuts and seeds — that resist digestion in the small intestine and pass to the large intestine, where some types are fermented by gut bacteria.
A fibre supplement is a measured amount of one specific dietary fibre, sold as a powder, capsule or sachet, intended to add to the fibre you already get from food. In Ireland it is a food supplement regulated by the FSAI, not a medicine, and it is not a substitute for a fibre-rich diet. The most common supplement fibres are soluble: inulin (from chicory), psyllium husk, partially hydrolysed guar gum (PHGG) and resistant maltodextrin. The strongest, regulated signals come from specific fibres at specific doses — for example psyllium husk and normal blood cholesterol at 7 g/day, and native chicory inulin and normal bowel function at 12 g/day. Healthy Origins Sunfiber PHGG (225g, €25.95) is a single-fibre powder available with tracked delivery from Dublin.
- What it is: A measured dose of one specific dietary fibre, as powder, capsule or sachet
- EFSA adequate intake (adults): 25 g fibre/day (EFSA Journal, 2010;8(3):1462)
- Main supplement fibres: Inulin, psyllium husk, PHGG (Sunfiber), resistant maltodextrin
- Type: Most supplement fibres sold here are soluble fibres
- Psyllium husk, authorised claim: Normal blood cholesterol at 7 g/day (EU Reg 432/2012)
- Native chicory inulin, authorised claim: Normal bowel function at 12 g/day (EU Reg 2015/2314)
- Is it a medicine? No. It is a food supplement regulated by the FSAI
- Vegan-suitable? Most powders yes; capsule shell varies (HPMC or gelatine) — check the label
- Irish regulatory status: Food supplement under FSAI guidelines — not a medicine
- Irish VAT rate on supplements: 13.5%
- A fibre supplement is not a replacement for a fibre-rich, varied diet
- It is not a medicine and is not intended to treat, cure or prevent any disease
- It is not a weight-loss product — no such claim is authorised for these fibres in the EU
- One fibre is not interchangeable with another: inulin, psyllium and PHGG behave differently
- An authorised claim for one fibre at one dose is not a general claim that "fibre does X"
- More is not better: adding too much too fast commonly causes gas and bloating
What is well-supported: EFSA set the adult adequate intake at 25 g fibre/day (EFSA Journal, 2010;8(3):1462). Specific fibres hold authorised EU claims at defined doses — psyllium husk and normal cholesterol at 7 g/day, native chicory inulin and normal bowel function at 12 g/day.
What is not proven: There is no blanket "fibre improves health" claim. Effects are fibre-specific and dose-specific, and most people will not reach the claim doses from a single small scoop.
Most relevant human dose range: Supplement fibres are typically used at 3–15 g/day; authorised-claim doses are 7 g (psyllium), 3 g (beta-glucan, cholesterol) and 12 g (native chicory inulin).
Key safety note: Increase fibre gradually and take gel-forming fibres such as psyllium with plenty of fluid. Check with a GP or pharmacist if pregnant, on medication or under medical care.
| Feature | Detail | Evidence / status |
|---|---|---|
| Adult fibre target (EFSA) | 25 g/day adequate intake | EFSA DRV 2010 |
| Soluble fibres sold here | Inulin, psyllium, PHGG, resistant maltodextrin | Confirmed |
| Psyllium & normal cholesterol | 7 g/day psyllium husk | Authorised EU claim |
| Native chicory inulin & bowel function | 12 g/day | Authorised EU claim |
| PHGG / Sunfiber claim | No authorised EU claim | Used as low-FODMAP fibre |
| "Fibre treats a disease" | Not made anywhere on this page | Not permitted |
| Irish regulatory status | Food supplement, 13.5% VAT | FSAI |
The fibre research and authorised EU claims discussed here relate to specific fibres at specific daily doses. They should not be read as a claim that any single product produces these effects. The products linked from this guide are food supplements, not medicines. PHGG (Sunfiber) does not currently hold an authorised EU health claim, and none is made for it on this page or on the product.
Healthy Origins Sunfiber — single-fibre PHGG powder
An unflavoured, low-FODMAP soluble fibre that dissolves clear and doesn't thicken. 6.5g of dietary fibre per scoop from one ingredient. A common starting point for people sensitive to inulin or chicory fibres.
- What is dietary fibre?
- How much fibre do adults need in Ireland?
- Soluble vs insoluble fibre
- Types of fibre supplement
- Which fibre supplement should you choose?
- Authorised EU health claims for specific fibres
- How to start without discomfort
- Fibre supplements in Ireland: rules, VAT, delivery
- Frequently asked questions
What is dietary fibre?
Dietary fibre is the part of plant foods that the body does not break down and absorb in the small intestine. Instead it passes to the large intestine, where some fibres are fermented by gut bacteria and others mainly add bulk and hold water.1
It is found naturally in wholegrains, vegetables, fruit, pulses, nuts and seeds. A single food usually contains a mix of fibre types. A fibre supplement is different: it provides one specific, characterised fibre in a known amount.
That distinction matters for the rest of this guide. When research or EU law refers to "fibre," it almost always means one named fibre at one dose — not fibre in general.
How much fibre do adults need in Ireland?
The European Food Safety Authority set an adequate intake of 25 g of dietary fibre per day for adults.1 This is the figure most widely lifted when people ask how much fibre they need, and it applies in Ireland as part of EU dietary reference values.
Surveys consistently show average intakes below this level across Western populations. That gap is the practical reason people look at a supplement.
The honest framing: food comes first. A supplement adds a measured top-up of one fibre. A single small scoop or a few capsules will not, on its own, close a large daily gap or reach the doses used in the authorised claims below.
A 6.5g scoop of PHGG is about a quarter of the 25 g daily target. Two servings, plus a normal varied diet, moves most people meaningfully closer. The point of a supplement is to add a known quantity, not to do the whole job alone.
Soluble vs insoluble fibre
Fibre is broadly split into two types. Soluble fibre dissolves in water; some soluble fibres form a gel (psyllium), while others are readily fermented by gut bacteria (inulin). Inulin, psyllium, PHGG and resistant maltodextrin are all soluble fibres.
Insoluble fibre does not dissolve. It adds bulk and helps move material through the gut, and is found mainly in wholegrains, wheat bran and the skins of vegetables.
Most fibre supplements sold in Ireland are soluble fibres. Insoluble fibre is largely a food story — bran, wholegrain bread, vegetables. A varied diet provides both, which is why the food-first message holds.
Psyllium absorbs water and forms a gel that adds bulk to stool. Must be taken with plenty of fluid.
Soluble · gel-formingInulin is fermented by gut bacteria in the colon, producing short-chain fatty acids. More likely to cause gas if increased quickly.
Soluble · fermentablePHGG (Sunfiber) dissolves clear, does not thicken and is fermented gently. Often tolerated by people sensitive to inulin.
Soluble · low-FODMAPBran and wholegrain fibre add bulk and hold water. Mostly obtained from food rather than supplements.
Insoluble · food-basedTypes of fibre supplement
Four soluble fibres make up most of the supplement market. Each is a different substance with different behaviour. Here is what each one is.
Inulin (chicory root)
A soluble, fermentable prebiotic fibre, usually extracted from chicory root, sold as an unflavoured powder. Native chicory inulin holds an authorised EU claim for normal bowel function at 12 g/day.2 Because it ferments readily, it is the fibre most likely to cause gas if you scale up too fast.
Psyllium husk (Plantago ovata)
A gel-forming soluble fibre from the seed husk of Plantago ovata, sold as capsules or powder. It carries authorised EU claims for an increase in faecal bulk and for maintenance of normal blood cholesterol, both at 7 g/day of psyllium husk.6 It must be taken with enough fluid to form its gel safely.
Partially hydrolysed guar gum (PHGG / Sunfiber)
A low-viscosity soluble prebiotic fibre, often sold under the Sunfiber name. It dissolves clear, has no taste and does not thicken, which is why it is widely used as a low-FODMAP fibre by people who find inulin or chicory fibres harsh. PHGG does not currently hold an authorised EU health claim.
Resistant maltodextrin (e.g. Fibersol)
A soluble, digestion-resistant fibre with a neutral taste, used to add fibre without changing texture. Our NOW Prebiotic Fiber with Fibersol-2 is the resistant-maltodextrin option in the range (check the page for current stock).
| Fibre | Type | Format | Behaviour | Authorised EU claim |
|---|---|---|---|---|
| Inulin (chicory) | Soluble, fermentable | Powder | Prebiotic; can cause gas if scaled fast | Bowel function (12 g/day, native chicory inulin) |
| Psyllium husk | Soluble, gel-forming | Powder / capsules | Bulks & binds; needs fluid | Faecal bulk & cholesterol (7 g/day) |
| PHGG (Sunfiber) | Soluble, low-viscosity | Powder | Dissolves clear, gentle, low-FODMAP | None — used as a tolerable fibre |
| Resistant maltodextrin | Soluble, digestion-resistant | Powder | Neutral, mixes invisibly | None at standard supplement doses |
| Beta-glucan (oats/barley) | Soluble, viscous | Food / oat bran | Viscous; mainly a food fibre | Cholesterol (3 g/day); post-meal glucose (4 g/30 g carbs) |
Which fibre supplement should you choose?
There is no single best fibre — the right one depends on what you want and how your gut tolerates it. A simple way to decide:
Sensitive digestion, or reacts to inulin? PHGG (Sunfiber) is the usual starting point. It dissolves clear, doesn't thicken and is widely used as a low-FODMAP fibre. See the low-FODMAP fibre and gut health guide for the evidence context.
Want a fermentable prebiotic fibre? Inulin from chicory feeds gut bacteria and is the archetypal prebiotic. Start low — it is the most likely to cause gas if you increase too quickly.
Prefer capsules over powder, or want bulking? Psyllium husk in capsule form. Take with plenty of water.
Want a tasteless powder that mixes invisibly? Resistant maltodextrin (Fibersol) or PHGG.
Want fibre alongside live cultures? A combination product such as Swanson Probiotic + Prebiotic Fibre. If you are weighing fibre against cultures, the probiotics vs prebiotics guide sets out the difference.
Authorised EU health claims for specific fibres
This is where fibre differs from many supplements. Some specific fibres do hold authorised EU health claims — but each is tied to one named substance at a defined daily dose, in fixed wording. A claim for one fibre is never a general claim that "fibre does X."
Native chicory inulin and normal bowel function. EFSA concluded that consuming at least 12 g/day of native chicory inulin increases stool frequency, and the claim was authorised by Commission Regulation (EU) 2015/2314.2 A randomised, double-blind, placebo-controlled trial (Micka et al., Int J Food Sci Nutr, 2017; n=44) found 12 g/day significantly increased bowel-movement frequency versus placebo (p=0.038).4 The claim applies to native chicory inulin (mean DP ≥9), not to every inulin or oligofructose product.
Psyllium husk and normal blood cholesterol. Psyllium husk holds an authorised EU claim for contributing to the maintenance of normal blood cholesterol levels at 7 g/day (Regulation (EU) No 432/2012).6 A 2018 systematic review and meta-analysis of randomised controlled trials (Jovanovski et al., Am J Clin Nutr, 2018;108(5):922-932, PMID 30239559) found psyllium fibre significantly lowered LDL cholesterol, non-HDL cholesterol and apolipoprotein B.5 At 700 mg per capsule, 7 g/day is around ten capsules — a practical point worth noting.
Beta-glucans (oats/barley). Beta-glucans hold authorised EU claims for normal blood cholesterol at 3 g/day, and for reducing the blood-glucose rise after a meal at 4 g per 30 g of available carbohydrates (Regulation (EU) No 432/2012).6 EFSA later reviewed a request to lower the glucose-claim dose to 2 g and concluded the effect was not consistently shown below 4 g — a useful reminder that the dose is part of the claim, not a detail.
No general fibre claim, and tolerance varies. There is no authorised EU claim that dietary fibre as a category improves health, manages weight or treats any condition. Fermentable fibres such as inulin can also worsen gas and bloating in sensitive individuals, particularly those reacting to FODMAPs — which is precisely why low-FODMAP PHGG exists as an alternative. Benefit is fibre-specific, dose-specific and person-specific.
How to start a fibre supplement without discomfort
The most common complaint with fibre is gas or bloating, and it is almost always a "too much, too fast" problem rather than a sign the fibre is wrong. A gradual ramp solves it for most people.
Begin with about half a serving once a day, with a full glass of water. Let your gut meet the fibre before you scale.
Move to a full serving once a day if comfortable. Keep fluids up, especially with gel-forming psyllium.
Add a second serving if you want more, or hold steady. Gas usually eases as the gut adapts.
Treat the supplement as a top-up to a fibre-rich diet, not a replacement for it.
Gel-forming fibres such as psyllium must be taken with adequate fluid. If you are pregnant or breastfeeding, on medication, or have a diagnosed digestive condition, speak to your GP or pharmacist before starting a fibre supplement. Persistent changes in bowel habit should be checked by a doctor.
Fibre supplements in Ireland: rules, VAT, delivery
In Ireland, fibre supplements are sold as food supplements and are regulated by the Food Safety Authority of Ireland (FSAI).7 They are not medicines. Only authorised EU health claims, in their authorised wording and at the defined dose, may be made for a specific fibre — which is why this guide attributes claims to named fibres at named doses rather than to "fibre" in general.
VAT on food supplements in Ireland is 13.5%. Our Fibre range ships next-day from our Dublin base by tracked DPD, free over €75. Because everything ships from within Ireland, there is no customs charge, including under the rules applying from 1 July 2026.8
You can browse the full range on the Fibre Supplements Ireland collection, or see Prebiotics for fibre paired with live cultures.
Product details referenced in this guide — Healthy Origins Natural Healthy Fiber (Sunfiber PHGG, 225g, 6.5g fibre per 7.5g scoop, €25.95 inc. 13.5% VAT), NOW Organic Inulin (from €18.95), NOW Psyllium Husk 700mg (180 caps, €34.95) and Swanson Probiotic + Prebiotic Fibre (60 caps, €18.95) — were verified by Probiotic.ie from current product listings. Stock and pricing may change; check the live product page before purchase.
The authorised claims and trials above relate to specific fibres at specific doses. They are not a claim that Healthy Origins Sunfiber, or any product linked here, produces those effects. These are food supplements, not medicines, and PHGG holds no authorised EU health claim.
Start gently with Sunfiber PHGG
If you want one clean, well-tolerated soluble fibre to add to water, tea or food, PHGG is the easiest place to start — no taste, no thickening, low-FODMAP.
Frequently asked questions
How much fibre do adults need per day in Ireland?
The European Food Safety Authority (EFSA NDA Panel, EFSA Journal 2010;8(3):1462) set an adequate intake of 25 g of dietary fibre per day for adults. Most of this should come from food: wholegrains, vegetables, fruit, pulses, nuts and seeds. A fibre supplement adds a measured amount of one specific fibre on top of a varied diet. It is a food supplement, not a medicine.
What is the difference between soluble and insoluble fibre?
Soluble fibre dissolves in water and forms a gel or is fermented in the colon; inulin, psyllium, PHGG and resistant maltodextrin are soluble fibres. Insoluble fibre does not dissolve and adds bulk; it is found mainly in wholegrains, bran and the skins of vegetables. Most fibre supplement powders sold in Ireland are soluble fibres. A varied diet provides both types.
Can I take a fibre supplement every day?
Fibre is a normal part of the daily diet, and fibre supplements are designed for regular use. The sensible approach is to start with a smaller amount, take it with plenty of water, and build up gradually over one to two weeks to reduce gas or bloating. Follow the directions on the product label. If you are pregnant, taking medication or under medical care, check with your GP or pharmacist first.
Which fibre supplement should I choose?
It depends on what you want from it. Inulin is a fermentable prebiotic fibre from chicory root, sold as an unflavoured powder. Psyllium husk is a gel-forming fibre that adds bulk to stool, sold as powder or capsules. Partially hydrolysed guar gum (PHGG, often sold as Sunfiber) is a low-viscosity soluble fibre that dissolves clear, does not thicken and is commonly used by people sensitive to inulin. Resistant maltodextrin is a neutral-tasting digestion-resistant fibre. Each product page lists the fibre type and amount per serving.
Can I take fibre supplements during pregnancy?
Dietary fibre is part of a normal balanced diet during pregnancy. If you are considering a fibre supplement while pregnant or breastfeeding, speak to your GP, midwife or pharmacist first, take it with plenty of water and follow the label. This guide is educational and not a substitute for personalised medical advice.
Are fibre supplements suitable for vegans?
Most fibre powders are plant-derived and suitable for vegans, including inulin, psyllium husk and PHGG. Capsule products depend on the capsule shell, which may be vegetarian hypromellose (HPMC) or gelatine. Check the capsule type and full ingredients on the individual product page.
Do fibre supplements cause bloating or side effects?
Adding fibre too quickly can cause temporary gas, bloating or cramping, especially with fermentable fibres such as inulin. Starting low, increasing gradually and drinking enough water reduces this. Gel-forming fibres such as psyllium must be taken with adequate fluid. People sensitive to fermentable (FODMAP) fibres often tolerate PHGG better. If you have a diagnosed digestive condition, check with a healthcare professional before use.
Is psyllium or inulin better for cholesterol?
Under EU law, psyllium husk carries an authorised health claim for contributing to the maintenance of normal blood cholesterol levels at a daily intake of 7 g of psyllium husk (Regulation (EU) No 432/2012). Inulin does not hold a cholesterol claim; native chicory inulin instead holds an authorised claim for normal bowel function at 12 g/day (Regulation (EU) 2015/2314). These claims apply to the specific fibre at the specific dose, not to every product, and are matters of regulated nutrition science rather than medical treatment.
Are fibre supplements legal in Ireland?
Yes. Fibre supplements are sold legally in Ireland as food supplements, regulated by the Food Safety Authority of Ireland (FSAI). They are not medicines. Only authorised EU health claims, in their authorised wording and at the defined dose, may be made for a specific fibre. VAT on food supplements in Ireland is 13.5%.
Where can I buy fibre supplements in Ireland?
Probiotic.ie stocks inulin, psyllium husk, PHGG (Sunfiber) and prebiotic fibre as powders and capsules in its Fibre collection, dispatched next-day from Dublin with free delivery over €75 and no customs charge. Healthy Origins Natural Healthy Fiber (Sunfiber PHGG, 225g) is €25.95 including 13.5% VAT.
- Dietary fibre is a group of plant carbohydrates the body does not fully digest.
- A fibre supplement is not a replacement for a fibre-rich diet, and not a medicine.
- EFSA set the adult adequate intake at 25 g of fibre per day (EFSA Journal, 2010;8(3):1462).
- Most supplement fibres sold in Ireland are soluble: inulin, psyllium, PHGG and resistant maltodextrin.
- Psyllium husk holds an authorised EU claim for normal blood cholesterol at 7 g/day (Reg 432/2012).
- Native chicory inulin holds an authorised EU claim for normal bowel function at 12 g/day (Reg 2015/2314).
- Oat/barley beta-glucan holds authorised EU claims at 3 g/day (cholesterol) and 4 g per 30 g carbs (post-meal glucose).
- PHGG (Sunfiber) holds no authorised EU claim but is widely used as a low-FODMAP fibre.
- There is no authorised EU claim that fibre as a category improves health — benefit is fibre-specific and dose-specific.
- In Ireland, fibre supplements are FSAI-regulated food supplements at 13.5% VAT, with Healthy Origins Sunfiber PHGG (225g) at €25.95 from Probiotic.ie.
This guide was prepared by Probiotic.ie using the following process:
- Reviewed the primary sources: the EFSA dietary reference values for fibre (2010), the EFSA opinion and Regulation (EU) 2015/2314 on native chicory inulin, and Regulation (EU) No 432/2012 for psyllium and beta-glucan claims.
- Verified the psyllium evidence against the Jovanovski et al. 2018 meta-analysis (PMID 30239559) and the inulin trial (Micka et al. 2017).
- Attributed every authorised claim to one named fibre at its defined dose — no blanket "fibre does X" claims.
- Separated regulated nutrition claims from medical treatment throughout.
- Verified product details (fibre type, dose, price, stock) against the live Probiotic.ie listings.
- Made no disease-treatment claims for any fibre or product.
- EFSA NDA Panel. Scientific Opinion on Dietary Reference Values for carbohydrates and dietary fibre. EFSA Journal. 2010;8(3):1462. — efsa.europa.eu/en/efsajournal/pub/1462
- EFSA NDA Panel. Scientific Opinion on native chicory inulin and maintenance of normal defecation by increasing stool frequency. EFSA Journal. 2015;13(1):3951. — efsa.europa.eu/en/efsajournal/pub/3951
- Commission Regulation (EU) 2015/2314 authorising a health claim on native chicory inulin and normal bowel function. — eur-lex.europa.eu/eli/reg/2015/2314/oj
- Micka A, Siepelmeyer A, Holz A, Theis S, Schön C. Effect of consumption of chicory inulin on bowel function in healthy subjects with constipation: a randomized, double-blind, placebo-controlled trial. Int J Food Sci Nutr. 2017;68(1):82-89. DOI: 10.1080/09637486.2016.1212819. — doi.org/10.1080/09637486.2016.1212819
- Jovanovski E, Yashpal S, Komishon A, et al. Effect of psyllium (Plantago ovata) fiber on LDL cholesterol and alternative lipid targets: a systematic review and meta-analysis of RCTs. Am J Clin Nutr. 2018;108(5):922-932. PMID 30239559. — pubmed.ncbi.nlm.nih.gov/30239559
- Commission Regulation (EU) No 432/2012 establishing a list of permitted health claims made on foods (psyllium husk; beta-glucans). — eur-lex.europa.eu/eli/reg/2012/432/oj
- Food Safety Authority of Ireland (FSAI). Food Supplements legislation and guidance. — fsai.ie/legislation/food-legislation/food-supplements
- Probiotic.ie. Customs Charges Ireland (July 2026 rules). — probiotic.ie/pages/customs-charges-ireland