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.

Reduce stroke risk

What this outcome means

Stroke is a sudden interruption of blood flow to the brain that can injure brain tissue and affect movement, speech, or thinking. On DoseRank it maps to a defined health outcome built from human studies on cerebrovascular event incidence, recurrence rates, and neurologic impairment scores – data sourced from open sources and specialized resources. DoseRank is not medical advice.

Who it's for

Elevated vascular riskPeople with blood pressure or circulation factors that weigh on the brain.

Prior-event historyThose who have had a stroke or warning episode before.

Aging cardiovascular healthOlder adults tracking long-term brain and blood-vessel wellbeing.

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

Evidence level

92Strong

Folic Acid – has strong public evidence. DoseRank looks at both evidence quality and formula fit. A DoseFit Score of 90 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

Folic Acid is the best supported ingredient signal for this outcome.

Dose matchedDoseFit 90

Scores reward products dosed inside or above the studied range, not just the right ingredient. Examples: In range: Folic Acid 800 mcg vs 400-800 mcg.

Processed

4.1k

Available

4.1k

Ingredients

Brands

456

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.

Reduce stroke risk

What this outcome means

Who it's for

Elevated vascular riskPeople with blood pressure or circulation factors that weigh on the brain.

Prior-event historyThose who have had a stroke or warning episode before.

Aging cardiovascular healthOlder adults tracking long-term brain and blood-vessel wellbeing.

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

Evidence level

92Strong

Best ingredients

Folic Acid is the best supported ingredient signal for this outcome.

Dose matchedDoseFit 90

Scores reward products dosed inside or above the studied range, not just the right ingredient. Examples: In range: Folic Acid 800 mcg vs 400-800 mcg.

Processed

4.1k

Available

4.1k

Ingredients

Brands

456

Coverage

100%

Relevant ingredients

Which ingredient types matter for strokeOpen to see which ingredient types matter for stroke

4.1k products across 4 ingredient types — open to filter the ranking.

Use types to filter ranked products

Vitamins

1.6k 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: ,

Electrolytes

530 products

Charged minerals – sodium, potassium, magnesium – that drive hydration and nerve signaling. Balance between them matters more than loading any single one.

Typical: ,

Minerals & Trace Elements

1.8k products

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

Typical:

Antioxidants & Bioactive Compounds

64 products

Molecules that neutralize free radicals and tune cell signaling. Helpful in balance; mega-doses can blunt the body's own adaptive defenses.

Typical:

Top decision cards

Best products for stroke

Ranking by · Composite outcome score

Best overall — the composite outcome score.

Top pick · DoseRank

Why this ranks #1 for stroke

NOW Foods, Folic Acid, 250 Tablets

NOW Foods$0.02 / serving4.8 · 43,957Available now

Also helps with

Congenital anomaly

Homocysteine

Folate status

Why this ranks here

Evidence fitFolic Acid is the strongest evidence signal for this outcome.
Dose fitFolic Acid at 800 mcg lands inside the studied 400-800 mcg window.
Price / serving$0.02 per serving — low 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

800 mcgIn rangeinside the studied 400-800 mcg window

25 mcg

Compare top 3 Product data Open at retailer

The rest of the ranking · DoseRank

Top 10 ranked products

Natural Factors, Folic Acid, 90 Tablets

Natural FactorsClinical89Dose fit91Popularity80$0.06/ serving

Solgar, Folate, 1,333 mcg DFE, 250 Tablets

SolgarClinical89Dose fit90Popularity76$0.04/ serving

21st Century, Folic Acid, 800 mcg, 180 Easy to Swallow Tablets

21st CenturyClinical89Dose fit90Popularity68$0.03/ serving

Natural Factors, Hi Potency B Complex, 90 Capsules

Natural FactorsClinical89Dose fit91Popularity84$0.11/ serving

Force Factor, B Complex, 60 Vegetable Capsules

Force FactorClinical89Dose fit90Popularity84$0.09/ serving

21st Century, PreNatal with Folic Acid, 60 Tablets

21st CenturyClinical89Dose fit90Popularity84$0.13/ serving

21st Century, Folic Acid, 400 mcg, 250 Easy to Swallow Tablets

21st CenturyClinical87Dose fit67Popularity96$0.02/ serving

Swanson Vitamins, Folic Acid, 800 mcg, 250 Vegan Capsules

Swanson VitaminsClinical89Dose fit90Popularity76$0.03/ serving

Source Naturals, B-50 Complex, 100 Tablets

Source NaturalsClinical89Dose fit90Popularity76$0.11/ serving