Psyllium vs acacia gum vs PHGG: what the trials show for each

|Dr Brad Stanfield
Three glasses on a pale stone counter. The left holds an opaque beige psyllium gel flecked with husk, firm enough to hold a spoon upright. The other two hold thin, pale, slightly hazy liquids that look alike, their spoons leaning at the same angle.

Psyllium husk, acacia gum and partially hydrolyzed guar gum (PHGG) are the three fibers most people end up choosing between. Psyllium has by far the largest trial base, including 28 pooled trials on LDL cholesterol. Acacia gum mixes into water almost invisibly and ferments more than psyllium, not less. PHGG is guar gum cut down so that it stops thickening, and it costs about three times as much per gram of fiber as the other two. If you have not narrowed the field to these three yet, start with our guide to which fiber supplement does what.

Written by Dr Brad Stanfield, a general practitioner registered in New Zealand and Australia. Check every number against the sources at the end. This is general information, not medical advice.

The short version

  • Psyllium is the only one of the three with pooled randomized evidence on cholesterol: 28 trials in 1,924 adults, a median dose of 10.2 g a day, LDL cholesterol 0.33 mmol/L lower.
  • In a 2013 incubation with human gut bacteria, gum arabic, which is acacia gum, was fermented to a greater extent than psyllium, and psyllium more than a cellulose derivative.
  • Partially hydrolyzed guar gum (PHGG) is guar gum cut into short pieces so it no longer thickens. The original gum is 200 to 300 times more viscous at a fifth of the concentration.
  • The largest acacia trial split 180 adults with constipation-predominant irritable bowel syndrome across three groups. The roughly 55 analyzed on acacia averaged 1.3 more stools a week than at baseline, against 0.4 on placebo; no other measure differed from placebo, and the acacia maker Nexira helped fund it.
  • At United States retail prices on 22 September 2026, psyllium and acacia both work out near 4 cents per gram of fiber. Partially hydrolyzed guar gum is about 14 cents.
  • Psyllium is the one of the three most likely to carry a choking warning on its label. United States rules for over-the-counter drug products name psyllium and guar gum among the gums whose labels must carry that warning and direct you to take them with at least 8 ounces of fluid.

What psyllium husk, acacia gum and PHGG each are

Psyllium husk, acacia gum and PHGG are all soluble fibers sold as powders, but they come from different plants and behave differently in water.

Psyllium husk is the ground outer coat of the seed of Plantago ovata, a plantain grown mostly in India. It is soluble, it forms a strong gel in water, and it resists fermentation better than most soluble fibers. Those two properties together are why it has the deepest evidence base on the shelf.

Acacia gum, sold interchangeably as gum arabic, is the dried sap of the Acacia senegal and Acacia seyal trees, tapped across the Sahel. Its known uses go back about 5,000 years, and soft drinks and confectionery account for about 70 percent of demand today, according to the World Bank's 2007 policy note on the trade. It dissolves completely and barely thickens water at all. The trees, the harvest and every human trial of acacia gum, with its funding, are on a page of their own.

Partially hydrolyzed guar gum, usually shortened to PHGG and sold under brand names including Sunfiber, starts as guar gum from the guar bean. Guar gum is one of the most powerful thickeners in food manufacturing. An enzyme chops the molecule into shorter pieces, which destroys the thickening on purpose and leaves a fiber that dissolves invisibly. Yoon and colleagues, at Taiyo Kagaku, the company that makes Sunfiber, put the average molecular weight of the hydrolyzed version at 20,000 daltons against 200,000 to 300,000 for the intact gum.

Three small heaps on a dark wooden board: translucent amber nodules of hardened acacia tree sap on the left, pale flaky psyllium seed husk in the middle, and small round grayish-white guar seeds on the right beside a cluster of four short, fuzzy dried guar pods.
The three start out as very different things: hardened tree sap, a seed coat, and a bean.

Which thickens water: psyllium, acacia gum or PHGG?

Viscosity, how much a fiber thickens the water it dissolves into, separates psyllium husk, acacia gum and PHGG more than any other property. Psyllium sits at the top. When Dikeman and colleagues measured a panel of fibers hydrated at 0.5 to 2 percent in 2006, guar gum, psyllium and xanthan gum "had the highest viscosities, regardless of concentration". Acacia gum sits at the bottom: the 2021 feeding study that tested it in healthy adults, paid for by the acacia maker Nexira, opens by calling it "a non-viscous soluble fiber". PHGG was engineered to sit at the bottom too. In Yoon's figures, a 5 percent solution of PHGG measures about 10 millipascal seconds, the unit viscosity is measured in, while native guar gum at a fifth of that concentration measures 2,000 to 3,000, which makes it 200 to 300 times thicker.

That matters for two separate reasons. The gel is the mechanism behind the cholesterol effect, so losing it loses that effect. And the gel that forms in your gut is the same gel that forms in your glass, so there is no version of psyllium that is both gel-forming and thin.

What psyllium husk, acacia gum and PHGG each do to a glass of water Three glasses compared. Psyllium husk sets into a gel thick enough to hold a spoon upright, and its label directs the user to drink it promptly with a full glass of water. Acacia gum stays thin and clear and was described as a non-viscous soluble fiber in a 2021 feeding trial. Partially hydrolyzed guar gum measures about 10 millipascal seconds in a 5 percent solution, against 2,000 to 3,000 millipascal seconds for the native guar gum it is made from at 1 percent. What each one does to a glass of water How each one behaves in cold water Psyllium husk Sets into a gel. A spoon stands up. Its label says drink it promptly. Acacia gum Stays thin and clear. A 2021 trial calls it a non-viscous fiber. PHGG About 10 mPa·s at 5%. Native guar gum is 2,000 to 3,000 at 1%.
Sources: Dikeman 2006 for psyllium, Larson 2021 for acacia gum, Yoon 2008 for the guar figures.

How much psyllium, acacia gum and PHGG the trials used

Dose is where most comparisons of psyllium, acacia gum and PHGG go wrong, because the three are not used at the same amount and the number on the tub is powder, not fiber. Psyllium's studied dose is around 10 g a day: the median across the 28 cholesterol trials was 10.2 g, and the large constipation trial used 5.1 g twice a day. United States labeling rules set the threshold for the psyllium heart claim at 7 g or more a day of soluble fiber from psyllium seed husk. Acacia gum's trials have used 5 to 70 g a day (5 to 40 g in the dose-ranging trial). PHGG is studied at a lower dose, 5 to 6 g a day.

The gap between powder and fiber is real and rarely explained. The PHGG trial that used 5 g of powder states plainly that this was 4 g of total dietary fiber by one assay and 3.5 g by another, so even the same material gives two different fiber numbers depending on the method. Retail labels tell the same story: a 9 g scoop of psyllium husk powder declares 7 g of fiber, and a 6.5 g scoop of acacia declares 6 g.

Fiber and the dose the trials used Tested on Adults randomized
Psyllium husk. 10.2 g a day, about 8 g of it fiber LDL cholesterol, then stool water and output 1,924 across 28 trials, then 170 across two groups
Acacia gum. 5 to 40 g a day, about 90% of it fiber Stool frequency, then gut bacteria counts 180 across three groups, then 51 across six
PHGG. 5 to 6 g a day, about 4 g of it fiber Bloating score, then stool form 121 across two groups, then 44 across two

  • Psyllium husk. 10.2 g a day, about 8 g of it fiber

    Tested on
    LDL cholesterol, then stool water and output
    Adults randomized
    1,924 across 28 trials, then 170 across two groups

  • Acacia gum. 5 to 40 g a day, about 90% of it fiber

    Tested on
    Stool frequency, then gut bacteria counts
    Adults randomized
    180 across three groups, then 51 across six

  • PHGG. 5 to 6 g a day, about 4 g of it fiber

    Tested on
    Bloating score, then stool form
    Adults randomized
    121 across two groups, then 44 across two

Fiber-in-dose figures come from the labels of currently sold products and, for PHGG, from the trial's own assay. US adults eat about 16 g of fiber a day, according to a 2015 analysis of national survey data funded by Kellogg, a cereal company; two of its authors were paid consultants to Kellogg and the third had worked for Kellogg. Against the recommendations that leaves shortfalls from about 5 g a day for a woman over 50 to about 22 g for a man under 51, a gap set out in how much fiber US adults eat against what is recommended, so a single serving of any of the three closes the small end of that range rather than all of it.

Psyllium, acacia gum or PHGG: which ferments most and causes the most gas

Fermentation is what gut bacteria do to a fiber that reaches the large intestine: they break it down for fuel and release short-chain fatty acids and gas. Among psyllium husk, acacia gum and PHGG, the two thin fibers, acacia gum and PHGG, are both fermented more than psyllium, a point often reported backwards.

The clearest measurement is from the University of Minnesota in 2013. Bliss and colleagues incubated gum arabic, psyllium and carboxymethylcellulose with human gut bacteria and reported that "the extent of in vitro fermentation was greater for gum arabic (GA) than for psyllium (PSY), which was greater than that for carboxymethylcellulose (CMC)". The time course separates speed from extent. At three hours, gum arabic had produced 34.2 mL less gas per gram of organic matter than psyllium. Over the incubation it gained 7.5 mL per gram per hour on psyllium, overtook it by the nine hour mark, and stayed the highest from there on. Acacia is slow. It is not light. Gut bacteria ferment nearly all of it in the end, more slowly than inulin-type fibers, as the fermentation evidence for acacia gum sets out.

Gas production from fermentation over time for gum arabic and carboxymethylcellulose, measured against psyllium A line chart with psyllium held at zero. In a 2013 study incubating human gut bacteria with each fiber, gum arabic produced 34.2 milliliters less gas per gram of organic matter than psyllium at the 3 hour mark, then gained 7.5 milliliters per gram per hour on psyllium, overtaking it by the 9 hour mark and staying the highest thereafter. Carboxymethylcellulose started 32.1 milliliters per gram below psyllium and averaged 5.1 milliliters per gram per hour below it. Acacia starts slower, then overtakes Gas from fermentation, difference from psyllium. Milliliters per gram of organic matter, in a dish. +40 0 -40 -80 3 h 6 h 9 h 12 h Psyllium Gum arabic Carboxymethylcellulose Bliss 2013, human gut bacteria in a dish.
Lines drawn from the three hour values and hourly rates the paper reports, with psyllium set at zero.

PHGG is the other readily fermented one. The trial that fed it to healthy adults for three months, run by employees of Taiyo Kagaku, which makes Sunfiber, measured a rise in Bifidobacterium in the stool, which is fermentation doing its work. So on the common question of which fiber causes the least gas, the answer among these three is psyllium. The fiber that ferments least of all is methylcellulose, which is not one of the three and is covered in the guide to seven fiber supplements.

Gas is also not a side issue you can design around. The 2016 meta-analysis of fiber in chronic constipation pooled seven randomized trials and found flatulence significantly higher on fiber than on placebo, with a standardized mean difference of 0.56, which is a moderate effect. Fermentable fiber produces gas. That is the mechanism working, not a fault. How quickly to raise the dose, and what happened in the trials that built up slowly, is covered in the evidence on adding fiber without the bloating.

What psyllium, acacia gum and PHGG have been shown to do

Psyllium husk and LDL cholesterol

LDL cholesterol is where psyllium husk has its strongest evidence, and neither acacia gum nor PHGG has anything to match it. A 2018 meta-analysis in the American Journal of Clinical Nutrition pooled 28 randomized trials in 1,924 people. A median dose of about 10.2 g a day lowered LDL cholesterol, short for low-density lipoprotein, by 0.33 mmol/L. Two related markers moved with it, non-HDL cholesterol down 0.39 mmol/L and apolipoprotein B down 0.05 g/L. Millimoles per liter is the unit a cholesterol test is reported in outside the United States, and 0.33 is roughly the distance between a reading of 3.50 and one of 3.17, or about 13 mg/dL. The effect is tied to the gel. A larger 2023 analysis of 89 trials in 4,755 adults compared gel-forming fibers against non-gelling cereal fiber and found the gel-formers 0.26 mmol/L lower on LDL. Acacia gum and PHGG do not form a gel, so this is not a result that transfers to them.

Psyllium husk and stool

The two main sources on psyllium and stool both come from Procter & Gamble, which makes the psyllium brand Metamucil. Johnson McRorie wrote the 2016 review from the company's clinical sciences group, and he was at Procter & Gamble for the 1998 trial too.

Psyllium's second claim rests on surviving the journey. McRorie and Chey put the rule bluntly in 2016: "If the soluble fiber is readily fermented, whether non-viscous or gel-forming, it has no effect on stool output or stool water content, and has no laxative effect." A fiber the bacteria have eaten cannot hold water in stool, because by the end there is no fiber left. Psyllium resists fermentation enough to still be there. In a 170-person randomized trial with no placebo arm, psyllium at 5.1 g twice a day raised stool water content by 2.33 percent against 0.01 percent for docusate sodium, a stool softener. It produced 359.9 g of stool a week against 271.9 g on docusate, and 3.5 bowel movements a week against 2.9, in treatment week 2. In week 1 the frequency difference was not there, 3.3 against 3.1.

One 2024 systematic review found kiwifruit beat psyllium on stool frequency by 0.36 bowel movements a week across 192 people. Food is a real competitor here, and whether you need a fiber supplement at all is a separate question.

Acacia gum and gut bacteria

Acacia gum's best-known result is on gut bacteria counts rather than on symptoms. A 2008 dose-ranging study by scientists at the ingredients company Kerry, on Kerry's own gum arabic, gave 5 to 40 g a day for four weeks and found bifidobacteria and lactobacilli counts rose, but each dose group held only about eight people, and the full list of acacia gum trials gives the details.

Acacia gum in its largest trial

The largest acacia trial, published by a Wageningen University team in 2024, split 180 adults with constipation-predominant irritable bowel syndrome across three groups for four weeks: acacia fiber, a probiotic or a maltodextrin placebo, each taken daily. The roughly 55 analyzed on acacia averaged 1.3 more stools a week than in their own four-week baseline, against 0.4 more on placebo, and stool consistency, stool mass, symptom severity and quality of life did not differ from placebo. The trial ran on a Dutch government grant that nine companies paid into, among them Nexira, which makes the acacia fiber tested, and the trial-by-trial account of acacia gum has the rest of its results.

PHGG, bloating and loose stool

PHGG has two small trials pointing in two useful directions. In 2016, 121 adults with a diagnosis of irritable bowel syndrome were randomized to 6 g a day or placebo for 12 weeks, and 108 were analyzed. The bloating score fell by 4.1 points against 1.2 on placebo, and bloating with gas by 4.3 against 1.1. Read those against the scale they sit on. The symptom journal scored every question from 0 to 70, and the standard deviation on that 4.1 was 13.4, more than three times the size of the difference itself. It is a real result and a small one. Everything else was flat: no effect on other symptoms, on the severity score, or on quality of life. Dropout was 49 percent on placebo and 22 percent on PHGG, which says something about who wanted to keep going. In 2019, 44 healthy adults whose stools ran loose took 5 g a day for three months, and stool form on the Bristol scale, the picture chart clinicians use to describe stool, normalized while frequency did not change. That trial was run by employees of Taiyo Kagaku, which makes Sunfiber. The 2016 trial was funded by two companies, Pro Natura and Sunwic, though the authors state they designed and ran it independently and declare no competing interests.

The acacia trial and the 2016 PHGG trial enrolled people with irritable bowel syndrome diagnosed against formal criteria, and the psyllium stool trial enrolled people with chronic constipation. What happened in those groups is a fact about those trials. It is not a statement about what a fiber will do for you, and nothing here is a suggestion to use any of them to manage a condition.

Adults in the largest published evidence for psyllium husk, acacia gum and partially hydrolyzed guar gum A bar chart. Psyllium husk: 1,924 adults across 28 randomized trials pooled in a 2018 meta-analysis of LDL cholesterol, counting everyone in those trials. Acacia gum: its largest trial, in 2024, randomized 180 adults across three groups, and about 55 were analyzed on acacia. Partially hydrolyzed guar gum: its largest trial randomized 121 adults across two groups, and 49 were analyzed on the fiber. The light bars count everyone randomized; the dark part of each single-trial bar is the people analyzed on that fiber. How much randomized evidence each one has Adults in the largest published evidence Psyllium husk 28 trials pooled, LDL cholesterol 1,924 Acacia gum One trial, three groups, stool pattern 180, about 55 on acacia PHGG One trial, two groups, bloating score 121, 49 on PHGG
The light bars count everyone randomized: 28 pooled trials for psyllium, and one trial each for acacia gum and PHGG. The dark part is the people analyzed on acacia gum or PHGG.

What psyllium, acacia gum and PHGG cost per gram of fiber

Cost per gram of fiber is rarely published, and it is the number that decides the purchase for anyone just closing the gap between what is recommended and what they eat. Below are three currently sold products, priced on 22 September 2026, with the fiber content taken from each product's own Supplement Facts panel. Two of the three are the same brand, which takes brand markup out of that half of the comparison. The PHGG is a different brand, so some of its premium may be the brand rather than the ingredient.

Product, pack and price Fiber in the pack, and cost per gram Per day at a trial dose
NOW Foods Psyllium Husk Powder. 340 g, $11.30 264 g, at 4.3 cents a gram 34 cents for 10.2 g of powder
NOW Foods Organic Acacia Fiber. 340 g, $12.49 314 g, at 4.0 cents a gram 37 cents for 10 g of powder
Tomorrow's Nutrition Sunfiber (PHGG). 210 g, $24.99 180 g, at 13.9 cents a gram 71 cents for 6 g of powder

  • NOW Foods Psyllium Husk Powder. 340 g, $11.30

    Fiber in the pack, and cost per gram
    264 g, at 4.3 cents a gram
    Per day at a trial dose
    34 cents for 10.2 g of powder

  • NOW Foods Organic Acacia Fiber. 340 g, $12.49

    Fiber in the pack, and cost per gram
    314 g, at 4.0 cents a gram
    Per day at a trial dose
    37 cents for 10 g of powder

  • Tomorrow's Nutrition Sunfiber (PHGG). 210 g, $24.99

    Fiber in the pack, and cost per gram
    180 g, at 13.9 cents a gram
    Per day at a trial dose
    71 cents for 6 g of powder

Psyllium and acacia land within half a cent of each other. PHGG costs about three times as much per gram of fiber as either of them. If the goal is simply more fiber, that is a lot to pay for the smaller trial base. Prices move, and a bulk bag of any of the three beats a retail tub, so treat the ranking as the durable part and the cents as a snapshot.

Where psyllium, acacia gum and PHGG each have the evidence

Psyllium husk is the only one of the three with pooled trial evidence on LDL cholesterol, from a 2018 analysis of 28 randomized trials in 1,924 adults.

Psyllium husk is also the only one of the three that resists fermentation well enough to still hold water in stool at the end of the gut, the property McRorie's reviews tie to softer, bulkier stool.

PHGG is the only one of the three with a trial designed around stool that runs loose: 44 healthy adults in 2019, in a trial run by employees of the company that makes it.

Acacia gum is the one that stays clear and thin in water. That is a texture advantage, not an efficacy one, and no trial has measured whether people keep taking one of these fibers longer than another.

Psyllium is also the least fermented of the three, so it produces the least gas of them. Methylcellulose, covered in how methylcellulose compares with six other fibers, is fermented even less.

Which of the three fibers has the trial evidence for each outcome A table of five rows, each an outcome and the fiber with the evidence for it. LDL cholesterol: psyllium, with 28 pooled trials. Stool water and bulk: psyllium. Firmer stool in adults whose stools run loose: partially hydrolyzed guar gum, in one trial of 44 people. Staying thin in water: acacia gum. Least gas of the three: psyllium, the least fermented. On cost, psyllium and acacia gum both work out at about 4 cents per gram of fiber and partially hydrolyzed guar gum at about 14 cents. Where each fiber has the evidence Read each row left to right LDL cholesterol Psyllium Stool water and bulk Psyllium Loose stool, firmer form PHGG Stays thin in water Acacia gum Least gas of the three Psyllium Cheapest per gram of fiber: psyllium and acacia, about 4 cents. PHGG is about 14 cents.
Four of the five rows point away from acacia gum.

Acacia gum is the fiber in Potassium Fiber, the drink this site sells, chosen because it stays thin enough to drink every day.

How to start psyllium, acacia gum or PHGG

Starting on half a scoop for the first week or two is the standard advice and may make the first weeks easier. It is advice rather than a proven fix: when a 1995 study in 14 healthy volunteers built up a dose of fructo-oligosaccharides slowly, tolerance was no better. The 2024 acacia trial built a similar ramp into its protocol, 5 g a day for the first five days and 10 g after that.

Dose size matters more than most labels admit. When 48 healthy adults were given 0, 20 and 40 g of acacia gum in a single serving with breakfast, in a 2021 study paid for by Nexira, they reported more bloating, more flatulence and more rumbling on the 40 g day, although the absolute tolerance scores stayed low throughout. Twenty grams is already twice a normal serving. Pushing the daily number higher still is its own mistake, set out in what the evidence says about 50 grams of fiber a day.

Psyllium has a separate requirement that is not about comfort. United States labeling rules cover water-soluble gums used as drug ingredients and name plantago seed, which is psyllium, and guar gum among them. Over-the-counter drug products that use one of them as an active ingredient must carry a choking warning and direct you to take them with at least 8 ounces of fluid, because a gel-former that hydrates on the way down can obstruct. A psyllium powder sold as a dietary supplement rather than as a laxative drug is not covered by that rule. Acacia gum is not among the gums that rule lists, though the list is explicitly not exhaustive. If you take psyllium, take it with a full glass and drink it promptly.

Other fiber supplements besides psyllium, acacia gum and PHGG

Beta-glucan, methylcellulose, inulin and wheat dextrin each get a section, along with the two properties that sort all seven, in our guide to seven fiber supplements and what each does.

Sources

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  2. Jovanovski E, Nguyen M, Kurahashi Y, et al. Are all fibres created equal with respect to lipid lowering? Comparing the effect of viscous dietary fibre to non-viscous fibre from cereal sources: a systematic review and meta-analysis of randomised controlled trials. British Journal of Nutrition. 2023;129(7):1180-1192. doi:10.1017/S0007114522002355
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  10. Niv E, Halak A, Tiommny E, Yanai H, Strul H, Naftali T, Vaisman N. Randomized clinical study: partially hydrolyzed guar gum (PHGG) versus placebo in the treatment of patients with irritable bowel syndrome. Nutrition and Metabolism. 2016;13:10. doi:10.1186/s12986-016-0070-5
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  16. United States Food and Drug Administration. 21 CFR 201.319, Water-soluble gums, hydrophilic gums, and hydrophilic mucilloids as active ingredients; required warnings and directions. govinfo.gov
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  18. NOW Foods Psyllium Husk Powder, 12 oz (340 g), Supplement Facts and price as listed on 22 September 2026. vitacost.com
  19. NOW Foods Certified Organic Acacia Fiber Pure Powder, 12 oz (340 g), Supplement Facts and price as listed on 22 September 2026. vitacost.com
  20. Tomorrow's Nutrition Sunfiber, 7.4 oz (210 g), Supplement Facts and price as listed on 22 September 2026. target.com
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This article is general information, not medical advice. Potassium Fiber is a drink powder with 8 grams of fiber from acacia gum and 500 mg of potassium as potassium citrate per scoop, on pre-sale and shipping from 1 December 2026.