Is a higher dose always better?

No. Dose-fit rewards landing inside the range studied for the outcome — over-dosing (common with melatonin) or under-dosing both lower the score. The goal is the effective dose, not the biggest number.

What does the Value score mean?

The Value score compares a product's price per serving with clinically relevant products ranked for the same outcome. A score of 50 is the typical price; above 50 means better value than typical, while below 50 means the product costs more than typical. It is a 0–100 value signal, not a percentile.

Why is the cheapest product not #1?

Cost is only one input. The cheapest pick here is a citrate form with weaker absorption and a stock-risk flag, so it leads on Value-for-cost but trails on the composite that also weighs evidence, dose fit and availability.

Are these affiliate links?

Retailer links may be affiliate links and DoseRank may earn a commission. Rankings and placement are determined by the scoring model only — never by payment from a brand.

Is this medical advice?

No. DoseRank summarizes evidence to help you choose; it is not a substitute for a clinician, especially if you are pregnant, breastfeeding, on medication, or managing a health condition.

Increase microbiome diversity

What this outcome means

Microbiome diversity describes how varied and balanced the community of microbes living in your gut is. On DoseRank it maps to a defined health outcome built from human studies on alpha-diversity indices, species richness, and microbial community composition from stool sequencing – data sourced from open sources and specialized resources. DoseRank is not medical advice.

Who it's for

Post-antibiotic resetRebuilding gut variety after a course of medication.

Low-fiber eatersLimited plant variety that narrows the microbial mix.

Gut-health curiousPeople who have tested their stool and want richer diversity.

Stack buildersAlready taking supplements such as Fiber Blends and want the dose right.

Evidence level

78Moderate-strong

Fiber Blends – has moderate public evidence for this outcome. This usually means there are smaller or mechanistic studies, but not randomized human trials. A DoseFit Score of 76 means this product's ingredient forms and doses are close to what was used in the studies behind this ranking - DoseRank weights each product ingredient.

Best available ingredients

Fiber Blends is the best supported ingredient signal for this outcome.

Dose matchedDoseFit 76

Scores reward products dosed inside or above the studied range, not just the right ingredient. Examples: In range: Fiber Blends 7990 mg vs 3000-15000 mg.

Processed

381

Available

381

Ingredients

Brands

106

Coverage

100%

How to read the scores

What every metric means

Each score is 0–100. Higher is better for every metric below.

CompositeThe overall DoseRank score — a weighted blend of clinical strength, evidence, dose fit, trust and value.Higher is better

ClinicalHow strongly the formula's ingredients and doses match what clinical studies used for this outcome.Higher is better

EvidenceHow much published human research backs the formula's key ingredients for this outcome — both how many studies exist and how strong they are.Higher is better

ValueHow the price per serving compares with similar products for this outcome — 50 is the typical price, higher means better value for your money.Higher is better

TrustHow well customers rate this product, with extra weight given to ratings backed by a large number of reviews.Higher is better

PopularityHow strongly this product sells compared with the other ranked products for this outcome.Higher is better

This legend covers the scores on this page — for data sources, scoring weights, and limits, read the full methodology →

Not sure which is right for you?

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Take 60-sec quiz

Get a personal report

A saved, shareable breakdown: your matched products, dose math, interaction flags to discuss with a clinician, and a price-tracked stack you can revisit.

Questions

Frequently asked

Each product gets a composite score blending clinical strength, evidence, dose fit, trust and value. The #1 on the DoseRank tab has the highest composite; the other tabs re-rank the same products by Value, Trust, or Popularity. Placement is never paid.

Increase microbiome diversity

What this outcome means

Who it's for

Post-antibiotic resetRebuilding gut variety after a course of medication.

Low-fiber eatersLimited plant variety that narrows the microbial mix.

Gut-health curiousPeople who have tested their stool and want richer diversity.

Stack buildersAlready taking supplements such as Fiber Blends and want the dose right.

Evidence level

78Moderate-strong

Best available ingredients

Fiber Blends is the best supported ingredient signal for this outcome.

Dose matchedDoseFit 76

Scores reward products dosed inside or above the studied range, not just the right ingredient. Examples: In range: Fiber Blends 7990 mg vs 3000-15000 mg.

Processed

381

Available

381

Ingredients

Brands

106

Coverage

100%

Relevant ingredients

Which ingredient types matter for microbiome diversityOpen to see which ingredient types matter for microbiome diversity

126 products across 1 ingredient types — open to filter the ranking.

Use types to filter ranked products

Fibers & Prebiotics

126 products

Indigestible carbs that feed gut bacteria and add bulk. Start low and ramp slowly – too much too fast means bloating and gas.

Typical: ,

Top decision cards

Best products for microbiome diversity

Ranking by · Composite outcome score

Best overall — the composite outcome score.

Top pick · DoseRank

Why this ranks #1 for microbiome diversity

MRM Nutrition, Whole Food, Organic Fiber with Enzymes and Prebiotics, 9.03 oz (256 g)

MRM Nutrition$0.45 / serving4.7 · 4,943Available now

Also helps with

Bowel regularity

Satiety

Digestive comfort

Why this ranks here

Evidence fitFiber Blends has moderate human evidence for this outcome.
Dose fitFiber Blends at 7990 mg lands inside the studied 3000-15000 mg window.
Price / serving$0.45 per serving — mid price tier for this outcome.
AvailabilityIn stock across major retailers; 99% availability confidence.
TrustStrong trust signals — consistently high marks from verified buyer ratings.

The numbers

7990 mgIn rangeinside the studied 3000-15000 mg window

100 GaIU

Compare top 3 Product data Open at retailer

The rest of the ranking · DoseRank

Top 10 ranked products

Garden of Life, Super Seed®, Beyond Fiber, 21 oz (600 g)

Garden of LifeClinical89Dose fit91Popularity80$0.63/ serving

Vital Nutrients, Hyperbiotics®, Prebiotic Powder, 13.33 oz (378 g)

Vital NutrientsClinical87Dose fit74Popularity68$0.57/ serving

Nature's Way, Fiber Fusion™ Daily, 150 Vegan Capsules

Nature's WayClinical86Dose fit67Popularity68$0.29/ serving

Yerba Prima, Daily Fiber® Formula, 12 oz (340 g)

Yerba PrimaClinical87Dose fit75Popularity50$0.43/ serving

Garden of Life, Dr. Formulated Organic Fiber, Citrus, 7.9 oz (223 g)

Garden of LifeClinical87Dose fit72Popularity68$0.45/ serving

Yerba Prima, Prebiotic Colon Care Formula, 12 oz (340 g)

Yerba PrimaClinical87Dose fit74Popularity50$0.44/ serving

California Gold Nutrition, GLP-1 Support Formula with Collagen Peptides, Prebiotic Fiber & Essential Amino Acids, Unflavored, 14.46 oz (410 g)

California Gold NutritionClinical87Dose fit71Popularity89$0.86/ serving

California Gold Nutrition, GLP-1 Support Formula with Collagen Peptides, Prebiotic Fiber & Essential Amino Acids, Watermelon Yuzu, 1.09 lb (494 g)

California Gold NutritionClinical87Dose fit71Popularity80$1.12/ serving

Yerba Prima, Soluble Fiber Formula, 12 oz (340 g)

Yerba PrimaClinical87Dose fit75Popularity30$0.40/ serving