How does DoseRank decide what ranks #1?

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.

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.

DOSERANKEVIDENCE-BASED SUPPLEMENTS

Reduce stroke risk

DOSERANKEVIDENCE-BASED SUPPLEMENTS

Best Supplements for Stroke — 3741 Ranked by Evidence | DOSERANK

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 · 44,441Available 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

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

SolgarClinical89Dose fit90Popularity72$0.05/ serving

Natural Factors, Folic Acid, 90 Tablets

Natural FactorsClinical89Dose fit91Popularity72$0.06/ serving

Force Factor, B Complex, 60 Vegetable Capsules

Force FactorClinical89Dose fit90Popularity90$0.09/ serving

Natural Factors, Hi Potency B Complex, 90 Capsules

Natural FactorsClinical89Dose fit91Popularity87$0.12/ serving

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

21st CenturyClinical89Dose fit90Popularity64$0.03/ serving

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

21st CenturyClinical87Dose fit67Popularity95$0.02/ serving

Nature's Bounty, Folic Acid, 800 mcg, 250 Tablets

Nature's BountyClinical89Dose fit90Popularity64$0.02/ serving

21st Century, PreNatal with Folic Acid, 60 Tablets

21st CenturyClinical89Dose fit90Popularity81$0.13/ serving

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

Swanson VitaminsClinical89Dose fit90Popularity72$0.03/ serving

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 · 44,441Available 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

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

SolgarClinical89Dose fit90Popularity72$0.05/ serving

Natural Factors, Folic Acid, 90 Tablets

Natural FactorsClinical89Dose fit91Popularity72$0.06/ serving

Force Factor, B Complex, 60 Vegetable Capsules

Force FactorClinical89Dose fit90Popularity90$0.09/ serving

Natural Factors, Hi Potency B Complex, 90 Capsules

Natural FactorsClinical89Dose fit91Popularity87$0.12/ serving

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

21st CenturyClinical89Dose fit90Popularity64$0.03/ serving

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

21st CenturyClinical87Dose fit67Popularity95$0.02/ serving

Nature's Bounty, Folic Acid, 800 mcg, 250 Tablets

Nature's BountyClinical89Dose fit90Popularity64$0.02/ serving

21st Century, PreNatal with Folic Acid, 60 Tablets

21st CenturyClinical89Dose fit90Popularity81$0.13/ serving

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

Swanson VitaminsClinical89Dose fit90Popularity72$0.03/ serving

Reduce stroke risk

Reduce stroke risk

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

Vitamins

Electrolytes

Minerals & Trace Elements

Antioxidants & Bioactive Compounds

Best products for stroke

NOW Foods, Folic Acid, 250 Tablets

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

Natural Factors, Folic Acid, 90 Tablets

Force Factor, B Complex, 60 Vegetable Capsules

Natural Factors, Hi Potency B Complex, 90 Capsules

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

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

Nature's Bounty, Folic Acid, 800 mcg, 250 Tablets

21st Century, PreNatal with Folic Acid, 60 Tablets

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

What every metric means

Compare the top 3, side by side

Not sure which is right for you?

Get a personal report

Frequently asked

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

Vitamins

Electrolytes

Minerals & Trace Elements

Antioxidants & Bioactive Compounds

Compare the top 3, side by side

Best products for stroke

NOW Foods, Folic Acid, 250 Tablets

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

Natural Factors, Folic Acid, 90 Tablets

Force Factor, B Complex, 60 Vegetable Capsules

Natural Factors, Hi Potency B Complex, 90 Capsules

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

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

Nature's Bounty, Folic Acid, 800 mcg, 250 Tablets

21st Century, PreNatal with Folic Acid, 60 Tablets

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

Reduce stroke risk

Reduce stroke risk

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

Vitamins

Electrolytes

Minerals & Trace Elements

Antioxidants & Bioactive Compounds

Best products for stroke

NOW Foods, Folic Acid, 250 Tablets

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

Natural Factors, Folic Acid, 90 Tablets

Force Factor, B Complex, 60 Vegetable Capsules

Natural Factors, Hi Potency B Complex, 90 Capsules

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

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

Nature's Bounty, Folic Acid, 800 mcg, 250 Tablets

21st Century, PreNatal with Folic Acid, 60 Tablets

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

What every metric means

Compare the top 3, side by side

Not sure which is right for you?

Get a personal report

Frequently asked

Related outcomes

Related outcomes

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

Vitamins

Electrolytes

Minerals & Trace Elements

Antioxidants & Bioactive Compounds

Compare the top 3, side by side

Best products for stroke

NOW Foods, Folic Acid, 250 Tablets

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

Natural Factors, Folic Acid, 90 Tablets

Force Factor, B Complex, 60 Vegetable Capsules

Natural Factors, Hi Potency B Complex, 90 Capsules

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

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

Nature's Bounty, Folic Acid, 800 mcg, 250 Tablets

21st Century, PreNatal with Folic Acid, 60 Tablets

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