What is the recommended dosage for Folate (Vitamin B9)?

General: 400 mcg DFE/day; Homocysteine Reduction: 400-800 mcg/day folic acid (with B12 and B6)

What are the side effects of Folate (Vitamin B9)?

Potential side effects include: Generally very well-tolerated, May mask vitamin B12 deficiency at high doses, Rare: mild gastrointestinal discomfort.

What is folate and how may it relate to cardiovascular health?

Folate (vitamin B9) is essential for homocysteine metabolism. Elevated homocysteine is an independent risk factor for cardiovascular disease. Folate supplementation effectively lowers homocysteine levels. However, large trials have not consistently shown that homocysteine lowering with B vitamins reduces cardiovascular events.

What dosage of folate has been studied for cardiovascular health?

Studies have used 400–5,000 mcg of folic acid per day for homocysteine reduction. The China Stroke Primary Prevention Trial (CSPPT) found that 800 mcg folic acid combined with enalapril reduced first stroke by 21% in hypertensive adults without prior stroke. The RDA is 400 mcg for adults.

What are the potential side effects of folate supplements?

Folic acid is generally safe at recommended doses. High doses may mask vitamin B12 deficiency, which can cause irreversible neurological damage. There is debate about whether excess folic acid may promote growth of pre-existing cancers. The tolerable upper intake level for synthetic folic acid is 1,000 mcg daily.

Folate (Vitamin B9)
Folate (Vitamin B9)

vitamin

Còn được gọi là: Folic Acid, L-Methylfolate, 5-MTHF, Vitamin B9

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About

Folate is essential for one-carbon metabolism and converts homocysteine to methionine, directly reducing plasma homocysteine — an independent cardiovascular risk factor. The CSPPT trial (20,702 hypertensive adults) found folic acid at 800 mcg/day reduced first stroke by 21%, though Western trials in folic acid-fortified populations showed less benefit.

How It Works

Essential cofactor in one-carbon metabolism; converts homocysteine to methionine via methionine synthase (with B12), directly reducing plasma homocysteine levels — an independent cardiovascular risk factor; supports endothelial function by enhancing nitric oxide production through tetrahydrobiopterin (BH4) recycling.

Evidence For Conditions

Tình trạng	Xếp hạng	Nghiên cứu	Người tham gia
Elevated Homocysteine (Hyperhomocysteinemia)	B	30	30000	Xem →
Coronary Artery Disease (CAD)	C	10	40000	Xem →

Side Effects

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

Drug & Supplement Interactions

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

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Related Ingredients

Vitamin D Vitamin K2 Niacin (Vitamin B3) Vitamin E

Thông tin nhanh

Liều lượng: General: 400 mcg DFE/day; Homocysteine_Reduction: 400-800 mcg/day folic acid (with B12 and B6)
Dạng bào chế: tablet capsule lozenge liquid
Nguồn tự nhiên: Dark leafy greens (spinach, kale), Lentils, Chickpeas, Asparagus, Broccoli, Fortified grains
Giới hạn trên: 1,000 mcg/day folic acid from supplements
Thời điểm tốt nhất: With or without food; consistent daily timing preferred

Tóm tắt bằng chứng

Elevated Homocysteine (Hyperhomocysteinemia) B

Coronary Artery Disease (CAD) C

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