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The Science

Built on the evidence, not the trend.

Daily Fiber is formulated around three plant fibers with distinct mechanisms and decades of peer-reviewed research behind them. This page walks through what each fiber does, how the formulation works in the body, and the studies behind it.

10 min readUpdated June 2026Sourced from peer-reviewed research

Start with how it works

How It Works

From scoop to systemic effect.

Daily Fiber doesn't act locally and stop. Its effects travel through the gut, into the microbiome, and into metabolic and inflammatory pathways across the body.

  1. Daily Fiber dissolved in water, hydrated and forming a gel in the upper digestive tract

    In the gut

    Hydration, bulk, and slowed transit.

    Once mixed with water, the fibers in Daily Fiber form a viscous gel as they hydrate in the stomach and small intestine. The gel bulks stool, slows gastric emptying, and modulates how quickly glucose is absorbed from the meal it's taken with. This is where regularity and post-meal blood sugar smoothing happen.

  2. Microbial fermentation in the colon producing short-chain fatty acids (SCFAs)

    In the colon

    Bacterial fermentation produces SCFAs.

    The PHGG and acacia in the formulation aren't digested by the small intestine; they pass through to the colon where beneficial bacteria (Bifidobacterium, Lactobacillus) ferment them into short-chain fatty acids: mainly butyrate, propionate, and acetate. SCFAs are the primary fuel source for the cells lining the colon and the signaling molecules behind the microbiome's broader health effects.

  3. Systemic effects of fiber: cardiovascular, metabolic, immune, and gut-brain axis

    Across the body

    Systemic effects compound over weeks.

    SCFAs aren't just colon-local. Butyrate strengthens the gut barrier (reducing inflammatory signaling), propionate influences hepatic glucose handling, and acetate participates in lipid metabolism. The microbiome shift over weeks of consistent fiber intake produces compounding effects on cardiovascular markers, glycemic control, and even mood via the gut-brain axis.

The Three Fibers

Each fiber does a different job.

Single-fiber products lean on one mechanism. Daily Fiber stacks three plant fibers, each with distinct evidence for a different aspect of gut health.

Psyllium husk fiber
Soluble fiber

Psyllium Husk

Plantago ovata

What it is

A water-soluble dietary fiber harvested from the seed husk of the Plantago ovata plant, native to South Asia. Forms a gel-like structure when hydrated.

How it works

Absorbs water in the small intestine to form a viscous gel that bulks and softens stool. The gel slows gastric emptying and modulates glucose absorption, which is why psyllium has independent evidence for cholesterol and blood sugar response in addition to regularity.

What studies show

Multiple systematic reviews and meta-analyses (including FDA-recognized health claims) show psyllium improves stool frequency and form, lowers LDL cholesterol, and supports glycemic control when taken consistently. The Bristol stool scale improvements are typically observed within 1-2 weeks of daily use.

References: 1, 2, 3

Partially hydrolyzed guar gum (PHGG)
Prebiotic fiber

Partially Hydrolyzed Guar Gum

Cyamopsis tetragonoloba

What it is

A water-soluble prebiotic fiber derived from the guar bean and enzymatically broken down to a lower molecular weight. The hydrolysis preserves the prebiotic effect while improving tolerability and reducing viscosity.

How it works

PHGG is fermented in the colon by beneficial bacteria (notably Bifidobacterium and Lactobacillus species), producing short-chain fatty acids like butyrate that nourish the colonic epithelium. Unlike inulin, PHGG ferments slowly and produces minimal gas, making it well-tolerated by sensitive guts.

What studies show

Randomized controlled trials in IBS patients have shown reduced symptom severity, normalized bowel habits, and improvements in quality-of-life scores. PHGG is one of the few prebiotics with positive evidence in both constipation- and diarrhea-predominant IBS.

References: 4, 5, 6

Acacia fiber from the Acacia senegal tree
Microbiome support

Acacia Fiber

Acacia senegal

What it is

A water-soluble dietary fiber extracted from the dried sap of the Acacia senegal tree. Composed primarily of arabinogalactan polysaccharides.

How it works

Acacia ferments slowly across the entire length of the colon (rather than mostly in the proximal colon like many prebiotics). This produces a more even distribution of short-chain fatty acids and tends to shift the microbiome toward greater diversity over time. The slow fermentation profile makes it one of the most tolerable fibers available.

What studies show

Clinical trials show acacia increases Bifidobacterium and Lactobacillus populations, improves measures of microbiome diversity, and is exceptionally well-tolerated even at doses where other fibers cause discomfort.

References: 7, 8

Clinical Evidence

What the research shows.

A selection of peer-reviewed studies relevant to the fibers in Daily Fiber. We've focused on randomized controlled trials and meta-analyses.

American Journal of Clinical Nutrition2018

Effect of psyllium fiber on LDL cholesterol and alternative lipid targets

Design Meta-analysis Sample 28 RCTs Duration Pooled 3+ weeks

Psyllium significantly reduced LDL cholesterol, non-HDL cholesterol, and apolipoprotein B across 28 randomized controlled trials, supporting its FDA-recognized heart health claim.

Read study
Nutrition & Metabolism2016

Partially hydrolyzed guar gum versus placebo in patients with irritable bowel syndrome

Design RCT Sample IBS patients Duration Multi-week

PHGG supplementation significantly improved bloating and overall symptom scores compared to placebo in patients with IBS, with high tolerability.

Read study
Nutrients2019

Repeated consumption of PHGG: effects on fecal characteristics and gut microbiota

Design RCT (double-blind) Sample Healthy adults Duration 3 weeks

Daily PHGG improved stool form toward the normal Bristol range and increased Bifidobacterium abundance versus placebo.

Read study
British Journal of Nutrition2008

Gum arabic establishes prebiotic functionality in a dose-dependent manner

Design RCT (dose-response) Sample Healthy volunteers Duration 4 weeks

Acacia (gum arabic) increased Bifidobacterium and Lactobacillus populations dose-dependently, with prebiotic effect at 10g comparable to inulin and better digestive tolerance.

Read study

Beyond Regularity

Fiber's effects don't stop at digestion.

The fibers in Daily Fiber influence body systems far beyond the colon. Short-chain fatty acids and gel formation in the gut trigger downstream effects across cardiovascular, metabolic, and even neurological pathways.

Cardiovascular

Lower LDL, healthier vessels.

Psyllium has FDA-recognized health claim status for cholesterol reduction. The gel it forms in the small intestine binds bile acids, prompting the liver to pull cholesterol from circulation to produce more. Meta-analyses consistently show 7-10% LDL reduction with daily psyllium intake.

Metabolic

Smoother glucose, steadier energy.

The viscous gel slows carbohydrate absorption from the small intestine, blunting post-meal glucose and insulin spikes. SCFAs from colonic fermentation also influence hepatic glucose output. Consistent fiber intake is associated with lower fasting glucose and improved insulin sensitivity over months.

Microbiome

More diversity, more good bacteria.

PHGG and acacia selectively feed beneficial gut bacteria (Bifidobacterium, Lactobacillus). Over weeks, this shifts the overall microbiome composition toward greater diversity, which is one of the most consistent markers of a healthy gut ecosystem in published research.

Immune

Stronger gut barrier, calmer inflammation.

Butyrate (a key SCFA) is the primary energy source for colonic epithelial cells and helps maintain tight junctions between them. A more intact gut barrier means fewer inflammatory triggers reaching systemic circulation, which is increasingly linked to chronic low-grade inflammation throughout the body.

Gut-Brain

The second-brain connection.

The gut microbiome produces ~90% of the body's serotonin and communicates with the brain via the vagus nerve and circulating SCFAs. Emerging research links fiber-rich diets to better mood scores, reduced anxiety markers, and improved cognitive measures, though this area is the newest and least settled.

Appetite & weight

Satiety, fewer cravings.

Soluble fiber slows gastric emptying and promotes the release of satiety hormones (GLP-1, PYY). The net effect: longer time between hunger signals, fewer between-meal cravings, and naturally smaller meal sizes for many people. Not a weight-loss drug, but a consistent appetite regulator.

Common Questions

Frequently asked.

Questions we get from clinicians, researchers, and informed consumers.

Why three fibers instead of one?

Each fiber in Daily Fiber addresses a different mechanism. Psyllium provides the bulk and viscosity needed for stool formation. PHGG selectively feeds beneficial bacteria like Bifidobacterium without the gas associated with inulin. Acacia ferments slowly across the entire colon, supporting microbiome diversity over time. A single fiber can do one of these well, but none can do all three.

How is this different from generic fiber supplements?

Most fiber supplements are single-ingredient (typically psyllium or wheat dextrin) and often include sweeteners, fillers, or stimulant laxatives. Daily Fiber is a clean three-fiber stack with no added sugar, no artificial sweeteners, and no stimulants.

Is the 6g dose enough to matter?

6g is calibrated to bridge the average fiber gap (about 10-15g/day) when combined with a typical diet. It's not designed to replace food-based fiber. Daily Fiber is a fortification strategy, not a substitute.

How long before the effects show up in studies?

Bowel regularity and bloating improvements typically appear within 1-2 weeks in published trials. Cholesterol and glycemic markers usually show measurable change by 4-8 weeks. Microbiome composition shifts begin within 2-3 weeks of consistent intake but stabilize over months.

Are there any populations who should avoid it?

Anyone with a known allergy to legumes should consult a clinician before taking PHGG. People taking medications that require precise absorption timing should separate dosing by at least 2 hours. Pregnant or nursing individuals should consult their provider before starting any new supplement.

References

Cited studies.

Peer-reviewed studies referenced throughout this page.

  1. McRorie JW Jr, McKeown NM. 2017. Understanding the physics of functional fibers in the gastrointestinal tract: an evidence-based approach to resolving enduring misconceptions about insoluble and soluble fiber. Journal of the Academy of Nutrition and Dietetics, 117(2), 251-264. https://pubmed.ncbi.nlm.nih.gov/27863994/
  2. Jovanovski E, et al.. 2018. Effect of psyllium (Plantago ovata) fiber on LDL cholesterol and alternative lipid targets: a systematic review and meta-analysis of randomized controlled trials. American Journal of Clinical Nutrition, 108(5), 922-932. https://pubmed.ncbi.nlm.nih.gov/30239559/
  3. Anderson JW, et al.. 2000. Cholesterol-lowering effects of psyllium intake adjunctive to diet therapy in men and women with hypercholesterolemia: meta-analysis of 8 controlled trials. American Journal of Clinical Nutrition, 71(2), 472-479. https://pubmed.ncbi.nlm.nih.gov/10648260/
  4. Niv E, et al.. 2016. Randomized clinical study: partially hydrolyzed guar gum (PHGG) versus placebo in the treatment of patients with irritable bowel syndrome. Nutrition & Metabolism, 13, 10. https://pubmed.ncbi.nlm.nih.gov/26855665/
  5. Polymeros D, et al.. 2014. Partially hydrolyzed guar gum accelerates colonic transit time and improves symptoms in adults with chronic constipation. Digestive Diseases and Sciences, 59(9), 2207-2214. https://pubmed.ncbi.nlm.nih.gov/24711073/
  6. Yasukawa Z, et al.. 2019. Effect of repeated consumption of partially hydrolyzed guar gum on fecal characteristics and gut microbiota: a randomized, double-blind, placebo-controlled, parallel-group clinical trial. Nutrients, 11(9), 2170. https://doi.org/10.3390/nu11092170
  7. Calame W, et al.. 2008. Gum arabic establishes prebiotic functionality in healthy human volunteers in a dose-dependent manner. British Journal of Nutrition, 100(6), 1269-1275. https://pubmed.ncbi.nlm.nih.gov/18466655/
  8. Cherbut C, et al.. 2003. Acacia gum is a bifidogenic dietary fibre with high digestive tolerance in healthy humans. Microbial Ecology in Health and Disease, 15(1), 43-50.
  9. Reynolds A, et al.. 2019. Carbohydrate quality and human health: a series of systematic reviews and meta-analyses. The Lancet, 393(10170), 434-445. https://pubmed.ncbi.nlm.nih.gov/30638909/
Try it

The science checks out.Now feel it for yourself.

30 servings per jar. 6g of fiber every morning. Three plant fibers, one daily ritual.

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