DOSERANKEVIDENCE-BASED SUPPLEMENTS© 2026 DoseRank · Evidence-based supplements
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DOSERANKEVIDENCE-BASED SUPPLEMENTSFull analysis

The short answer · Satiety

Take glucomannan for satiety. This is the one to buy.

NOW Foods, Glucomannan, Pure Powder, 8 oz (227 g)
1

NOW Foods, Glucomannan, Pure Powder, 8 oz (227 g)

4.6· 2,117 ratings· $0.14/serving

DoseRank score84

Glucomannan 2000 mg — inside the studied 2000-4000 mg window

Of 1,521 products scored for Satiety, NOW Foods, Glucomannan, Pure Powder, 8 oz (227 g) ranks #1 with a DoseRank score of 84. Glucomannan has moderate human evidence for this outcome.

View on iHerb— $0.14/sv
The form“Why Glucomannan — not Psyllium Husk or 5-Hydroxytryptophan (5-HTP)?”Evidence Moderate evidence

Glucomannan has moderate human evidence for this outcome.

  • GlucomannanThe pick

    Moderate evidence · 2000 mg

    Soluble fiber from konjac root that swells into a thick gel in the stomach; promotes satiety and slows gastric emptying, used for weight and blood-sugar support.

  • Psyllium Husk

    Moderate 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.

  • 5-Hydroxytryptophan (5-HTP)

    Moderate evidence · 300 mg

    Direct precursor to serotonin and melatonin; crosses the blood-brain barrier more readily than tryptophan and is commonly used to support mood and sleep onset.

Buy the #1 pick

Questions

Frequently asked

NOW Foods, Glucomannan, Pure Powder, 8 oz (227 g) ranks #1 for Satiety with a DoseRank score of 84. The score blends clinical strength, evidence, dose fit, trust signals and value across 1,521 products scored for this outcome.

Glucomannan has moderate human evidence for this outcome.

Glucomannan at 2000 mg lands inside the studied 2000-4000 mg window. DoseRank scores this product's dose fit at 67 out of 100.

NOW Foods, Glucomannan, Pure Powder, 8 oz (227 g) works out at $0.14 per serving. $0.14 per serving — mid price tier for this outcome. The cheapest ranked pick here is $0.10 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.

NOW Foods, Glucomannan, Pure Powder, 8 oz (227 g)

$0.14/serving · ★ 4.6 · In stock

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Cheaper alternative$0.10 per servingNutricost, Glucomannan, Unflavored, 17.9 oz (500 g)

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

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

Glucomannan at 2000 mg lands inside the studied 2000-4000 mg window.

Glucomannan

Studied window 2000-4000 mg · this pick 2000 mg

The ranking“Why should I trust this pick?”Trust 81

Solid trust signals from buyer ratings, with room to grow. 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.

  • 1,521 products scored
  • Never paid placement
  • Evidence level: Moderate · 78
  • 257 brands
  • 17 ingredients
See the full analysis — every score, every productHow the ranking works
The price“Can I do better than $0.14 a serving?”Value 76

$0.14 per serving — mid price tier for this outcome. The cheapest ranked pick here is $0.10 per serving.

  • 5
    Nutricost, Glucomannan, Unflavored, 17.9 oz (500 g)Score 81 · $0.10/serving
    iHerb
  • 3
    Micro Ingredients, Organic Psyllium Husk Powder, 2 lb (907 g)Score 82 · $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 $0.14 a serving.

NOW Foods, Glucomannan, Pure Powder, 8 oz (227 g) — in stock at a tracked retailer.

View on iHerb
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