DOSERANKEVIDENCE-BASED SUPPLEMENTS© 2026 DoseRank · Evidence-based supplements
Methodology·Outcomes·Categories·Blog
Support·Feedback
DOSERANKEVIDENCE-BASED SUPPLEMENTSFull analysis

The short answer · Irritable bowel symptom severity

Take psyllium husk for irritable bowel symptom severity. This is the one to buy.

Source Naturals, Psyllium Husk Powder, 12 oz (340 g)
1

Source Naturals, Psyllium Husk Powder, 12 oz (340 g)

4.7· 5,653 ratings· $0.18/serving

DoseRank score83

Psyllium Husk 5 g — inside the studied 5-20 g window

Of 1,814 products scored for Irritable bowel symptom severity, Source Naturals, Psyllium Husk Powder, 12 oz (340 g) ranks #1 with a DoseRank score of 83. Psyllium Husk is the strongest evidence signal for this outcome.

View on iHerb
The form“Why Psyllium Husk — not Peppermint Oil or Partially Hydrolyzed Guar Gum (PHGG)?”Evidence Strong evidence

Psyllium Husk is the strongest evidence signal for this outcome.

  • Psyllium HuskThe pick

    Strong evidence · 5 g

    Soluble fiber from psyllium seed husks; swells into a gel in the gut, lowering LDL cholesterol and regularizing bowel transit — requires adequate fluid intake.

  • Peppermint Oil

    Strong evidence · 400 mg

    Essential oil of Mentha piperita; its menthol relaxes gut smooth muscle, making enteric-coated capsules a go-to for IBS cramping and bloating.

  • Partially Hydrolyzed Guar Gum (PHGG)

    Strong evidence · 6 g

    Soluble, low-viscosity prebiotic fiber derived from guar beans; well tolerated at typical doses and used to support regularity and gut microbiome balance.

Buy the #1 pick

Questions

Frequently asked

Source Naturals, Psyllium Husk Powder, 12 oz (340 g) ranks #1 for Irritable bowel symptom severity with a DoseRank score of 83. The score blends clinical strength, evidence, dose fit, trust signals and value across 1,814 products scored for this outcome.

Psyllium Husk is the strongest evidence signal for this outcome.

Psyllium Husk at 5 g lands inside the studied 5-20 g window. DoseRank scores this product's dose fit at 67 out of 100.

Source Naturals, Psyllium Husk Powder, 12 oz (340 g) works out at $0.18 per serving. $0.18 per serving — mid price tier for this outcome. The cheapest ranked pick here is $0.14 per serving.

No. Retailer links may be affiliate links, but rankings and placement are never paid. Every product is scored by the same public model, and the ranking is recomputed from the underlying product data rather than edited by hand.

Use rankings as research support

DoseRank rankings are informational and not medical advice. If you are pregnant, breastfeeding, using medications, or managing a health condition, ask a qualified clinician whether a supplement fits your situation. Stop use and report concerning adverse events to a clinician, the product maker, or the retailer.

Disclosure

Retailer links may be affiliate links. Rankings and placement are not paid placement.

Source Naturals, Psyllium Husk Powder, 12 oz (340 g)

$0.18/serving · ★ 4.7 · In stock

60-sec quizView on iHerb
— $0.18/sv
60-sec quiz instead
Cheaper alternative$0.14 per servingMicro Ingredients, Organic Psyllium Husk Powder, 2 lb (907 g)

Retailer links may be affiliate links. Rankings and placement are never paid.

The dose“Is the dose actually effective?”Dose fit 67

Psyllium Husk at 5 g lands inside the studied 5-20 g window.

Psyllium Husk

Studied window 5-20 g · this pick 5 g

The ranking“Why should I trust this pick?”Trust 93

Strong trust signals — consistently high marks from verified buyer ratings. Each product gets a DoseRank score blending clinical strength, evidence, dose fit, trust and value. Retailer links may be affiliate links — the scoring model decides placement, never payment from a brand.

  • 1,814 products scored
  • Never paid placement
  • Evidence level: Strong · 92
  • 259 brands
  • 21 ingredients
See the full analysis — every score, every productHow the ranking works
The price“Can I do better than $0.18 a serving?”Value 79

$0.18 per serving — mid price tier for this outcome. The cheapest ranked pick here is $0.14 per serving.

  • 2
    Micro Ingredients, Organic Psyllium Husk Powder, 2 lb (907 g)Score 83 · $0.14/serving
    iHerb

Why not the absolute cheapest? The DoseRank score also weighs clinical strength, evidence, dose fit and trust — the very cheapest listings rarely hold up everywhere else.

Ready?

The #1 pick is $0.18 a serving.

Source Naturals, Psyllium Husk Powder, 12 oz (340 g) — in stock at a tracked retailer.

View on iHerb
Want it personal instead?

A saved, shareable breakdown: your matched products, dose math, and interaction flags to discuss with a clinician.

Or take the 60-sec quiz →