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.

Lower fasting blood sugar

What this outcome means

Fasting blood glucose is the level of sugar in your blood first thing, after you have gone several hours without eating. On DoseRank it maps to a defined health outcome built from human studies on fasting glucose in milligrams per deciliter, overnight blood sugar readings, and glycemic baseline – data sourced from open sources and specialized resources. DoseRank is not medical advice.

Who it's for

Watching blood sugarKeeping morning glucose readings within a steady, healthy range.

Higher-than-ideal morningsPeople whose fasting numbers creep above the target zone.

Family-history mindedAdults with a metabolic history watching glucose closely.

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

Evidence level

92Strong

Berberine – has strong public evidence. DoseRank looks at both evidence quality and formula fit. A DoseFit Score of 78 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 ingredients

Berberine is the best supported ingredient signal for this outcome.

Dose matchedDoseFit 78

Scores reward products dosed inside or above the studied range, not just the right ingredient. Examples: In range: Berberine 1000 mg vs 500-1500 mg.

Processed

Available

Ingredients

Brands

499

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?

Answer a few questions about your goals, habits, stack, and budget. Then, DoseRank will find the products that best match your needs based on your answers. It's free and only takes 60 seconds! No account is required.

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.

Lower fasting blood sugar

What this outcome means

Who it's for

Watching blood sugarKeeping morning glucose readings within a steady, healthy range.

Higher-than-ideal morningsPeople whose fasting numbers creep above the target zone.

Family-history mindedAdults with a metabolic history watching glucose closely.

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

Evidence level

92Strong

Best ingredients

Berberine is the best supported ingredient signal for this outcome.

Dose matchedDoseFit 78

Scores reward products dosed inside or above the studied range, not just the right ingredient. Examples: In range: Berberine 1000 mg vs 500-1500 mg.

Processed

Available

Ingredients

Brands

499

Coverage

100%

Relevant ingredients

Which ingredient types matter for fasting blood glucoseOpen to see which ingredient types matter for fasting blood glucose

2.3k products across 4 ingredient types — open to filter the ranking.

Use types to filter ranked products

Alkaloids & Stimulants

100 products

Plant-derived nitrogen compounds like caffeine that stimulate the nervous system. Effective but dose-sensitive, with real tolerance and dependence risk.

Typical:

Vitamins

822 products

Essential micronutrients the body can't make in sufficient amounts. Fat-soluble ones (A, D, E, K) store up; water-soluble ones need regular topping-up.

Typical: ,

Minerals & Trace Elements

1.3k products

Inorganic nutrients from calcium to zinc. The chemical form drives absorption – chelates and citrates usually beat cheap oxides.

Fibers & Prebiotics

104 products

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

Top decision cards

Best products for fasting blood glucose

Ranking by · Composite outcome score

Best overall — the composite outcome score.

Top pick · DoseRank

Why this ranks #1 for fasting blood glucose

Natural Factors, WellBetX® Berberine, 60 Vegetarian Capsules (500 mg per Capsule)

Natural Factors$0.30 / serving4.7 · 48,848Available now

Also helps with

Insulin resistance

HbA1c

LDL cholesterol

Why this ranks here

Evidence fitBerberine is the strongest evidence signal for this outcome.
Dose fitBerberine at 1000 mg lands inside the studied 500-1500 mg window.
Price / serving$0.30 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

1000 mgIn rangeinside the studied 500-1500 mg window

Compare top 3 Product data Open at retailer

The rest of the ranking · DoseRank

Top 10 ranked products

Best Naturals, Berberine, 500 mg, 120 Capsules

Best NaturalsClinical88Dose fit67Popularity91$0.16/ serving

Force Factor, Ultra Berberine™, Glucose & Metabolism Formula, 60 Vegetable Capsules

Force FactorClinical92Dose fit67Popularity89$0.54/ serving

Vitamatic, Berberine, 500 mg, 60 Vegetable Capsules

VitamaticClinical88Dose fit67Popularity98$0.22/ serving

EVLution Nutrition, Berberine, 60 Veggie Capsules, (500 mg mg per Capsule)

EVLution NutritionClinical88Dose fit67Popularity89$0.17/ serving

Force Factor, Berberine , 500 mg , 60 Vegetable Capsules

Force FactorClinical88Dose fit67Popularity89$0.22/ serving

Healths Harmony, Berberine HCL+, 120 Capsules

Healths HarmonyClinical91Dose fit77Popularity68$0.48/ serving

Solaray, Vital Extracts, Berberine, 500 mg, 60 VegCaps

SolarayClinical88Dose fit67Popularity98$0.36/ serving

Swanson Vitamins, Berberine Plus with Bitter Melon & Milk Thistle, 60 Capsules

Swanson VitaminsClinical90Dose fit67Popularity91$0.54/ serving

California Gold Nutrition, Berberine Advanced, Berbevis Phytosome with Berberine Phospholipid Complex with Sunflower Lecithin, 550 mg, 60 Veggie Capsules

California Gold NutritionClinical88Dose fit68Popularity99$0.38/ serving