Folate (Vitamin B9) for Coronary Artery Disease (CAD)

Q: Does Folate (Vitamin B9) help with Coronary Artery Disease (CAD)?

Based on 10 studies with 40,000 participants, there is limited but promising evidence that Folate (Vitamin B9) may support Coronary Artery Disease (CAD) management. Our evidence grade is C (Some Evidence).

Q: How much Folate (Vitamin B9) should I take for Coronary Artery Disease (CAD)?

Studies have used various dosages. A commonly studied range is 400 mcg DFE/day. Always consult your healthcare provider before starting any supplement regimen.

Q: Are there side effects of Folate (Vitamin B9)?

Reported side effects may include Generally very well-tolerated, May mask vitamin B12 deficiency at high doses, Rare: mild gastrointestinal discomfort. Most side effects are mild and dose-dependent. Consult your doctor if you experience any adverse reactions.

Q: How strong is the evidence for Folate (Vitamin B9) and Coronary Artery Disease (CAD)?

We rate the evidence as Grade C (Some Evidence). This rating is based on 10 peer-reviewed studies with 40,000 total participants. The overall direction of effect is mixed.

C Some Evidence Limited evidence from small studies, but some positive signals exist.

CSPPT showed stroke benefit but not MI benefit. HOPE-2 was negative for cardiovascular events despite homocysteine reduction. Research suggests benefit may be limited to populations without folic acid fortification.

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The Bottom Line

Key Study Findings

cross-sectional n=800

Excessive Daytime Sleepiness is Associated With Malnutrition, Dysphagia, and Vitamin D Deficiency in Older Adults.

Dose: None vs: Placebo Effect: OR 1.73 (malnutrition), OR 2.01 (dysphagia), OR 2.0 (vitamin D deficiency) <0.05

Meta-Analysis n=129

Effects of Nutritional Supplements and Dietary Interventions on Cardiovascular Outcomes: An Umbrella Review and Evidence …

Dose: None vs: None Outcome: Mortality Effect: None None

Population: None

Review

Folic acid and diseases - supplement it or not?

Dose: None vs: Placebo Effect: None None

Review

Prevention of strokes.

Dose: Antiplatelet, antihypertensives, statins vs: None Outcome: Stroke prevention Effect: None None

Population: Stroke-risk population

Key Statistics

Studies

40000

Participants

↔

Mixed

Grade

Referenced Papers

Excessive Daytime Sleepiness is Associated With Malnutrition, Dysphagia, and Vitamin D Deficiency in Older Adults. Other

Journal of the … 2021 22 citations

Effects of Nutritional Supplements and Dietary Interventions on Cardiovascular Outcomes: An Umbrella Review and Evidence Map. Meta-Analysis

Annals of internal … 2019 133 citations

Folic acid and diseases - supplement it or not? Review

Revista da Associacao … 2016 62 citations

Prevention of strokes. Review

Current atherosclerosis reports 2001 2 citations

Dosage & Usage

mg = milligrams · mcg = micrograms (1,000× smaller) · IU = International Units

Commonly Used Dosages

general:: 400 mcg DFE/day
homocysteinereduction:: 400-800 mcg/day folic acid (with B12 and B6)

Upper limit: 1,000 mcg/day folic acid from supplements

Dosages Studied in Research

Dosage	Duration	Effect	N
None	--	Positive	800
None	--	Neutral	129
None	--	Mixed	--
Antiplatelet, antihypertensives, statins	--	Positive	--

Best taken: With or without food; consistent daily timing preferred

Safety & Side Effects

Reported Side Effects

⚠ Generally very well-tolerated
⚠ May mask vitamin B12 deficiency at high doses
⚠ Rare: mild gastrointestinal discomfort

Known Interactions

● Methotrexate (folate may reduce efficacy)
● Antiepileptic drugs (phenytoin, carbamazepine — mutual interference)
● Vitamin B12 (co-supplementation recommended for homocysteine reduction)

Tolerable upper intake: 1,000 mcg/day folic acid from supplements

Always consult your healthcare provider before starting any supplement.

Frequently Asked Questions

Does Folate (Vitamin B9) help with Coronary Artery Disease (CAD)?

Based on 10 studies with 40,000 participants, there is limited but promising evidence that Folate (Vitamin B9) may support Coronary Artery Disease (CAD) management. Our evidence grade is C (Some Evidence).

How much Folate (Vitamin B9) should I take for Coronary Artery Disease (CAD)?

Studies have used various dosages. A commonly studied range is 400 mcg DFE/day. Always consult your healthcare provider before starting any supplement regimen.

Are there side effects of Folate (Vitamin B9)?

Reported side effects may include Generally very well-tolerated, May mask vitamin B12 deficiency at high doses, Rare: mild gastrointestinal discomfort. Most side effects are mild and dose-dependent. Consult your doctor if you experience any adverse reactions.

How strong is the evidence for Folate (Vitamin B9) and Coronary Artery Disease (CAD)?

We rate the evidence as Grade C (Some Evidence). This rating is based on 10 peer-reviewed studies with 40,000 total participants. The overall direction of effect is mixed.

Other ingredients for Coronary Artery Disease (CAD)

Omega-3 Fatty Acids (EPA/DHA) B Magnesium C Selenium C

Folate (Vitamin B9) for other conditions

Elevated Homocysteine (Hyperhomocysteinemia) B

Quick Verdict

Evidence Strength52%

Moderate confidence

Study Breakdown

RCT (0)Meta (1)Other (9)

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References

[1] Saadet Koc Okudur et al.. J Am Med Dir Assoc. 2021. Excessive Daytime Sleepiness is Associated With Malnutrition, Dysphagia, and Vitamin D Deficiency in Older Adults. doi:10.1016/j.jamda.2021.05.035 PubMed
[2] Safi U Khan et al.. Ann Intern Med. 2019. Effects of Nutritional Supplements and Dietary Interventions on Cardiovascular Outcomes: An Umbrella Review and Evidence Map. doi:10.7326/M19-0341 PubMed
[3] Siaw-Cheok Liew. Rev Assoc Med Bras (1992). 2016. Folic acid and diseases - supplement it or not? doi:10.1590/1806-9282.62.01.90 PubMed
[4] T J Jeerakathil et al.. Curr Atheroscler Rep. 2001. Prevention of strokes. doi:10.1007/s11883-001-0026-7 PubMed

FDA Disclaimer: These statements have not been evaluated by the Food and Drug Administration. The products and information on this website are not intended to diagnose, treat, cure, or prevent any disease. The evidence grades presented are based on our analysis of published peer-reviewed research and do not constitute medical advice. Always consult your healthcare provider before starting any supplement regimen.